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Kuru

Open access
Liberski, Pawel P., Sikorska, Beata, Lindenbaum, Shirley, Goldfarb, Lev G., McLean, Catriona, Hainfellner, Johannes A., Brown, Paul·2012·Journal of Neuropathology & Experimental Neurology

Abstract

Kuru was the first human transmissible spongiform encephalopathy (TSE) or prion disease identified, occurring in the Fore linguistic group of Papua New Guinea. Kuru was a uniformly fatal cerebellar ataxic syndrome, usually followed by choreiform and athetoid movements. Kuru imposed a strong balancing selection on the Fore population, with individuals homozygous for the 129 Met allele of the gene (PRNP) encoding for prion protein (PrP) being the most susceptible. The decline in the incidence of kuru in the Fore has been attributed to the exhaustion of the susceptible genotype and ultimately by discontinuation of exposure via cannibalism. Neuropathologically, kuru-affected brains were characterized by widespread degeneration of neurons, astroglial and microglial proliferation, and the presence of amyloid plaques. These early findings have been confirmed and extended by recent immunohistochemical studies for the detection of the TSE-specific PrP (PrP). Confocal laser microscopy also showed the concentration of glial fibrillary acidic protein-positive astrocytic processes at the plaque periphery. The fine structure of plaques corresponds to that described earlier by light microscopy. The successful experimental transmission of kuru led to the awareness of its similarity to Creutzfeldt-Jakob disease and Gerstmann-Sträussler-Scheinker disease and formed a background against which the recent epidemics of iatrogenic and variant Creutzfeldt-Jakob disease could be studied.

AI snapshot

Written from the paper’s full text.

TL;DR

Kuru is the first identified human prion disease, a uniformly fatal cerebellar ataxic syndrome in the Fore of Papua New Guinea, transmitted through endocannibalistic mortuary practices and shaped by strong balancing selection at PRNP codon 129. This review synthesizes genetic, anthropological, clinical, and neuropathological evidence showing that kuru behaves like sporadic CJD and that its decline reflected both cessation of exposure and depletion of susceptible genotypes.

Key findings

  • Kuru was a uniformly fatal cerebellar ataxic syndrome with tremor and choreiform/athetoid movements, divided into ambulant, sedentary, and terminal stages; duration from prodromal signs to death was about 12 months (range, 3–23 months).
  • PRNP codon 129 strongly influenced susceptibility: 129 Met/Met homozygotes had earlier onset and shorter incubation, whereas Met/Val and Val/Val carriers developed kuru later, after incubation periods of 20 years or longer, and many survived; survivors showed almost complete absence of the Met/Met genotype. In 1964–1988, 11 of 16 kuru cases had a 129 Val/Val genotype, and the last 11 known patients (1996–2004) had estimated minimum incubation periods of 34 to 41 years, with 8 of 10 heterozygous at codon 129.
  • Experimental transmission succeeded: brain tissue from 3 kuru patients transmitted illness to chimpanzees in 1965; overall, 18 cases transmitted kuru with a transmission rate of 95%, slightly higher than sporadic CJD (87%). Kuru PrPTSE showed type 2 or type 3 patterns, and transgenic mice expressing human PrP 129 valine lacked a transmission barrier to kuru, with kuru behaving like sporadic CJD.
  • Neuropathologically, kuru brains showed widespread neuronal degeneration, astroglial and microglial proliferation, and amyloid “kuru plaques” measuring 20–60 Hm (as printed) in diameter, most numerous in the cerebellar granular cell layer, basal ganglia, thalamus, and cerebral cortex; PrPTSE was present in plaques and synaptic/perineuronal sites, with spongiform change in deep cortical layers (III–V) of cingulate, entorhinal, and insular cortices and in the subiculum. The decline of kuru was attributed to discontinuation of exposure via cannibalism and exhaustion of the susceptible genotype, with strong balancing selection at PRNP.

Methods

  • Design: This is a narrative review; it does not report primary data collection or systematic review methods.
  • Data/sample: It synthesizes published clinical, genetic, anthropological, neuropathological, and transmission studies, including the Kuru Registry, stored brain tissue and DNA specimens, and case series such as 12 cases examined by Klatzo et al, 13 cases by Beck and Daniel, and 11 cases by McLean et al.
  • Main analysis: Narrative synthesis and comparison of kuru with sporadic CJD, iatrogenic CJD, variant CJD, and Gerstmann-Sträussler-Scheinker disease; no formal meta-analysis or statistical methods are described.

Limitations

  • Stated in the paper: systematic examinations of kuru brains have been performed on only a few dozen cases; ultrastructural data are extremely limited because of severe constraints on obtaining well-fixed material; results on GcAb-Ab genotype prevalence in kuru patients are very difficult to interpret; and the histogenesis of vacuoles is not well understood.
  • Evident from the text: as a narrative review, there is no systematic search strategy or quantitative synthesis; conclusions rely on historical, observational, and anthropological accounts, with small case numbers and potential recall or selection biases in the cannibalism and genetic data.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1097/nen.0b013e3182444efd

Cites

74 of 74 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

18 of 98 cited sources checked · 2 supported · 2 flagged · accuracy not yet measured

  • Interpretationcitation

    The loss of Met/Met genotype and accumulation of alternative alleles in the postepidemic Fore population was indicated by the finding that the PRNP V127V synonymous substitution that showed the highest frequency in the surviving elderly women is part of the 127GG-129VV haplotype.

    “The loss of Met/Met genotype and accumulation of alternative alleles in the postepidemic Fore population was also indicated by the finding that the PRNP V127V synonymous substitution that showed the highest frequency in the surviving elderly women is part of the 127GG–129VV haplotype (38).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [38] Mead S Whitfield J Poulter M A novel protective prion protein variant that colocalizes with kuru exposure N Engl J Med 2009 361 2056 65 19923577 source

      Split into 2 atoms — 0 confirmed, 1 partially supported, 1 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

      Checked by a reasoning model — may be wrong.

      Experimental — accuracy not yet measured
  • Premisecitation

    In contrast to classical studies, modern PrP immunohistochemistry studies stressed the presence of typical spongiform change, as in sporadic CJD, in deep cortical layers (III-V) of the cingulate, entorhinal and insular cortices, and in the subiculum.

    “In contrast to the classical studies described above, both articles stressed the presence of typical spongiform change present, as in sporadic CJD, in deep cortical layers (III–V) of the cingulate, entorhinal and insular cortices, and in the subiculum.”
    Quote in the paperSubstantial claim2 of 2 sources checked
    • cites [76] McLean CA Ironside JW Alpers MP Comparative neuropathology of kuru with the new variant of Creutzfeldt-Jakob disease: Evidence for strain of agent predominating over genotype of host Brain Pathol 1998 8 428 37 PMC8098151 9669694 source

      The Abstract (page unavailable) says the authors compared kuru and variant CJD using PrP immunohistochemistry, but it does not describe spongiform change in cortical layers III–V or the named regions. Searches for those layers and regions returned only the Abstract and References; our indexed copy points to a separate PDF for the full text, so the decisive findings may be missing. (LLM, conf=0.74)

      Experimental — accuracy not yet measured
    • cites [77] McLean CA The neuropathology of kuru and variant Creutzfeldt-Jakob disease Phil Trans R Soc 2008 363 3685 87 PMC2735511 18849282 source

      The passage on the 11 archival kuru cases (section labeled Abstract; page unavailable) reports spongiform change across cortical areas but explicitly excepts the insular gyri, contrary to the claim of insular involvement. It also does not locate the changes in layers III–V or the subiculum. (LLM, conf=0.78)

      Checked by a reasoning model — may be wrong.

      Experimental — accuracy not yet measured
  • Interpretationcitation

    The Met/Met genotype depletion in survivors was associated with increased susceptibility of 129 Met/Met carriers, who became early victims of the epidemic and disproportionally died after the shortest incubation time.

    “This phenomenon was associated with increased susceptibility of the 129 Met/Met carriers who became early victims of the epidemic, disproportionally dying of the disease after the shortest incubation time (24, 37).”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites [24] Cervenakova L Goldfarb L Garruto R Phenotype-genotype studies in kuru: Implications for new variant Creutzfeldt-Jakob disease Proc Natl Acad Sci USA 1998 95 13239 41 9789072 PMC23768 source

      The Results report that Met/Met kuru patients were overrepresented among younger cases, and the Discussion infers that homozygotes probably had shorter incubation periods than heterozygotes. The paper does not establish increased susceptibility or depletion of Met/Met survivors, and it presents the shorter incubation period as probable rather than measured. (LLM, conf=0.85)

      Experimental — accuracy not yet measured
    • cites [37] Lee H-S Brown P Cervenakova L Increased susceptibility to kuru of carriers of the PRNP 129 methionine/methionine genotype J Infect Dis 2001 183 192 96 11120925 source
  • Findingcitation

    Deficit of codon 129 homozygosity was found in elderly females who lived through the epidemic in high-exposure areas and attended multiple mortuary feasts.

    “Deficit of codon 129 homozygosity was also found in analysis of elderly females who lived through the epidemic in the high-exposure areas and attended multiple mortuary feasts (38).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [38] Mead S Whitfield J Poulter M A novel protective prion protein variant that colocalizes with kuru exposure N Engl J Med 2009 361 2056 65 19923577 source

      The Hardy-Weinberg Equilibrium section reports a marked deficit of codon 129 homozygosity in elderly women from midlevel- and high-exposure zones. The Study Sample and Exposure Index section says an earlier, smaller cohort of older women had attended multiple mortuary feasts, but it does not establish that the women in the expanded high-exposure analysis had each attended multiple feasts. Page numbers are not available in our copy. (LLM, conf=0.83)

      Experimental — accuracy not yet measured
  • Premisecitation

    Neuronal alterations in kuru are totally nonspecific in nature.

    “Neuronal alterations observed in many nuclei throughout the neuraxis, the anterior motor neurons of the spinal cord, brainstem, cerebellum, and cerebral cortex were totally nonspecific in nature (64);”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [64] Hainfellner J Liberski PP Guiroy DC Pathology and immunohistochemistry of a kuru brain Brain Pathol 1997 7 547 54 9034563 PMC8098557 source

      The Abstract (page unavailable) reports neuronal loss and its distribution but does not say that neuronal alterations were nonspecific. Searches for “totally nonspecific” and for neuronal alterations returned no supporting passage. Our indexed copy points to a separate PDF for the full text, so the decisive discussion may be missing. (LLM, conf=0.74)

      Experimental — accuracy not yet measured
  • May combine two claims. 38
  • Classified as probably not a substantial claim. 25
  • The quote only partly states this claim. 2
  • May combine two claims.

    Findingcitation

    129 Met/Val and Val/Val carriers developed kuru at a later age, after an incubation period of 20 years or longer, and many survived the epidemic.

    “Based on representative statistics, it was concluded that individuals homozygous for the 129 Met allele had an earlier age of disease onset and a shorter incubation time, whereas 129 Met/Val and Val/Val carriers developed kuru at a later age, after an incubation period of 20 years or longer, and many survived the epidemic (24).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [24] Cervenakova L Goldfarb L Garruto R Phenotype-genotype studies in kuru: Implications for new variant Creutzfeldt-Jakob disease Proc Natl Acad Sci USA 1998 95 13239 41 9789072 PMC23768 source

      The Results (page not provided) show that Met/Val patients were overrepresented in older age groups, and the Discussion infers that heterozygotes probably had longer incubation periods than homozygotes. The Results do not show later onset for Val/Val patients; Table 1 includes more Val/Val cases under age 15 than over age 30. The paper does not establish an incubation period of 20 years or longer or report that many carriers survived the epidemic. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Findingcitation

    Individuals homozygous for the 129 Met allele had an earlier age of disease onset and a shorter incubation time.

    “Based on representative statistics, it was concluded that individuals homozygous for the 129 Met allele had an earlier age of disease onset and a shorter incubation time, whereas 129 Met/Val and Val/Val carriers developed kuru at a later age, after an incubation period of 20 years or longer, and many survived the epidemic (24).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [24] Cervenakova L Goldfarb L Garruto R Phenotype-genotype studies in kuru: Implications for new variant Creutzfeldt-Jakob disease Proc Natl Acad Sci USA 1998 95 13239 41 9789072 PMC23768 source

      The Results report that Met/Met kuru patients were overrepresented at younger ages of onset, while the Discussion infers that homozygotes probably had a shorter incubation period than heterozygotes. The claim presents that inference as certain. The Results do not support grouping Val/Val carriers with Met/Val carriers as developing kuru later, and the paper does not establish a 20-year incubation period or that many carriers survived the epidemic. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    The Fore did not talk about rubbing their bodies with brain tissue when describing earlier events and have recently denied the practice.

    “However, the Fore did not talk about rubbing their bodies with brain tissue when describing earlier events and have recently denied the practice (52).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [52] Whitfield JP Pako WH Collinge J Mortuary rites of the South Fore and kuru Phil Trans R Soc B 2008 363 3721 24 18849288 PMC2581657 source

      The Introduction (page unavailable) concludes that intentional rubbing of brain tissue on mourners did not occur, and §5 says it was never rubbed on their bodies. These passages support the paper’s account of the practice, but do not establish the specific claims that the Fore omitted it when describing earlier events or recently denied it. (LLM, conf=0.83)

      Experimental — accuracy not yet measured
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    A recent investigation of Fore mortuary practices has shown that, by consuming deceased relatives, the Fore were ensuring that the souls of the departed reached the land of the dead, to be reborn as ancestors.

    “A recent investigation of Fore mortuary practices has shown that, by consuming deceased relatives, the Fore were ensuring that the souls of the departed reached the land of the dead, to be reborn as ancestors (52).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [52] Whitfield JP Pako WH Collinge J Mortuary rites of the South Fore and kuru Phil Trans R Soc B 2008 363 3721 24 18849288 PMC2581657 source
  • May combine two claims.

    Premisecitation

    Kuru is a uniformly fatal and remarkably stereotyped cerebellar ataxic syndrome accompanied by tremor and choreiform and athetoid movements.

    “Kuru is a uniformly fatal and remarkably stereotyped cerebellar ataxic syndrome accompanied by tremor and choreiform and athetoid movements (27, 39, 57–61)”
    Quote in the paperNot a substantial claim2 of 7 sources checked
    • cites [27] Gajdusek DC Zigas V Degenerative disease of the central nervous system in New Guinea. The endemic occurrence of “kuru” in the native population N Engl J Med 1957 257 974 78 13483871 source
    • cites [39] Collinge CJ Whitfield J McKintosh E Kuru in the 21st century—An acquired human prion disease with very long incubation periods Lancet 2006 367 2068 74 16798390 source
    • cites [57] Alpers MP Kuru: Age and Duration Studies Adelaide Department of Medicine 1964 12

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites [58] Beasley A Fore experiences on the kuru patrols Oceania 2009 79 34 52

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites [59] Collinge CJ Whitfield J McKintosch E A clinical study of kuru patients with long incubation periods at the end of the epidemic in Papua New Guinea Phil Trans R Soc B 2008 363 3725 39 18849289 PMC2581654 source

      The Introduction (page unavailable) describes progressive cerebellar ataxia, a well-characterized clinical progression, usually present tremor, and eventual death. It says athetoid and choreiform movements *may occur*, rather than presenting them as invariable accompaniments of kuru. (LLM, conf=0.85)

      Experimental — accuracy not yet measured
    • cites [60] Collinge J Lessons of kuru research: Background to recent studies with some personal reflections Phil Trans R Soc B 2008 363 3689 96 18849283 PMC2577136 source

      The paper’s Abstract describes people dying of kuru and notes clinical similarities between kuru and variant CJD. It does not describe kuru as a stereotyped cerebellar ataxic syndrome or specify tremor, choreiform movements, or athetoid movements; nor does it establish that the disease is uniformly fatal. (LLM, conf=0.72)

      Experimental — accuracy not yet measured
    • cites [61] Prusiner SB Gajdusek DC Alpers MP Kuru with incubation periods exceeding two decades Ann Neurol 1982 12 1 9 7114816 source
  • May combine two claims.

    Premisecitation

    Immunohistochemical studies revealed that PrPTSE is present not only as kuru plaques but also in synaptic and perineuronal sites and in the spinal cord within substantia gelatinosa in kuru.

    “Immunohistochemical studies revealed that PrPTSE was present not only as kuru plaques but also in synaptic and perineuronal sites (64) and in the spinal cord within substantia gelatinosa.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites [64] Hainfellner J Liberski PP Guiroy DC Pathology and immunohistochemistry of a kuru brain Brain Pathol 1997 7 547 54 9034563 PMC8098557 source

      The Abstract (no page given) reports anti-PrP immunocytochemistry in a kuru brain and describes both diffuse synaptic-type deposits and plaques. Our copy does not report perineuronal deposits or PrP in the spinal cord’s substantia gelatinosa; searches for those sites returned no supporting passage. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Findingcitation

    In our previous study on amyloid plaques in prion diseases, we demonstrated that kuru plaques morphologically and ultrastructurally resemble those characteristic of sporadic CJD subtype 3 according to the Parchi and Gambetti classification but are remarkably different from florid plaques in variant CJD and multicentric plaques in GSS.

    “In our previous study on amyloid plaques encountered in prion diseases (71), we demonstrated that kuru plaques morphologically and ultrastructurally resemble those that are characteristic of sporadic CJD subtype 3 according to the Parchi and Gambetti classification (22) but were remarkably different from florid plaques in variant CJD and multicentric plaques in GSS.”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites [71] Sikorska B Liberski PP Sobów T Ultrastructural study of florid plaques in variant Creutzfeldt-Jakob disease: A comparison with amyloid plaques in kuru, sporadic Creutzfeldt-Jakob disease and Gerstmann-Sträussler-Scheinker disease Neuropathol Appl Neurobiol 2009 35 46 59 18513219 source
    • cites [22] Parchi P Castellani R Capellari S Molecular basis of phenotypic variability in sporadic Creutzfeldt-Jakob disease Ann Neurol 1996 39 767 78 8651649 source
  • May combine two claims.

    Findingcitation

    Most young Fore males who developed kuru in 1957-1959 were Met/Met homozygous, whereas survivors exposed at the same age completely lacked the Met/Met genotype.

    “Most of the young Fore males who developed kuru in 1957–1959 were Met/Met homozygous, whereas survivors of the kuru epidemic who were exposed to the infection at the same age completely lacked the Met/Met genotype.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    In the frontal cortex of a kuru case, spongiform change was of moderate intensity, and GFAP-immunoreactive astrocytes were present.

    “In the frontal cortex, spongiform change was of moderate intensity, and glial fibrillary acidic protein (GFAP)–immunoreactive astrocytes were present.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). The quote only partly states this claim.

    Findingown data

    Dystrophic neurites were occasionally seen in the vicinity of amyloid plaques.

    “Occasionally, dystrophic neurites were seen in the vicinity.”
    Quote in the paperNot a substantial claim
  • The quote only partly states this claim.

    Findingown data

    PrPTSE immunohistochemistry revealed mostly synaptic deposits and plaques of varying size and shape in the frontal cortex.

    “The PrPTSE immunohistochemistry revealed mostly synaptic deposits and plaques of varying size and shape.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    In kuru and sporadic CJD, minimal immunoreactivity of MAP-tau was observed at the periphery of the plaques; this pattern differs from variant CJD and GSS, in which MAP-tau expression was much more robust.

    “In kuru and sporadic CJD, minimal immunoreactivity of MAP-tau was observed at the periphery of the plaques, that is, again, the pattern of MAP-tau immunoreactivity was different from that of variant CJD and GSS, in which the expression of this protein was much more robust.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    In kuru, in contrast to plaques in variant CJD and GSS, GFAP-positive astrocytic cell processes are observed around plaques and at the peripheral part of plaques; this phenomenon is seen, albeit to a slightly lesser degree, in sporadic CJD.

    “Moreover, in kuru, in contrast to plaques in variant CJD and GSS, we observed GFAP-positive astrocytic cell processes around plaques and at the peripheral part of plaques. This phenomenon was seen, albeit to a slightly lesser degree, in sporadic CJD.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    In kuru and sporadic CJD, some distended β-amyloid precursor protein-positive processes were observed, but they were dispersed throughout the cortex and not around the plaques.

    “In kuru and sporadic CJD, we also observed some distended β-amyloid precursor protein–positive processes, but they were dispersed throughout the cortex and not around the plaques.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Findingnone given

    From examination of the chimpanzee infected with the "K" kuru brain, typical autophagic vacuoles were illustrated, but the process was not mentioned.

    “From examination of the chimpanzee infected with the “K” kuru brain, the typical autophagic vacuoles were illustrated, but the process was not mentioned.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Multiple mutations in the PRNP gene have been linked to various phenotypes of hereditary, sporadic, and iatrogenic CJD.

    “Multiple mutations in the PRNP gene have been linked to various phenotypes of hereditary, sporadic, and iatrogenic CJD (25, 26).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [25] Palmer MS Dryden AJ Hughes JT Homozygous prion protein genotype predisposes to sporadic Creutzfeldt-Jakob disease Nature 1991 352 340 42 1677164 source
    • cites [26] Collinge J Palmer MS Dryden AJ Genetic predisposition to iatrogenic Creutzfeldt-Jakob disease Lancet 1991 337 1441 42 1675319 source
  • May combine two claims.

    Interpretationreasoning

    The decline of kuru incidence in the Fore was determined by the discontinuation of exposure and additionally by the exhaustion of the susceptible genotype.

    “Apparently, the decline of kuru incidence in the Fore was determined by the discontinuation of exposure and additionally by the exhaustion of the susceptible genotype.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisereasoning

    Cannibalism was no longer present in the 1960s, had been suppressed by the government and missions, but the Fore spoke openly about their practice of consuming deceased relatives.

    “No longer present in the 1960s, cannibalism had been suppressed by the government and missions, but the Fore spoke openly about their practice of consuming deceased relatives.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationcitation

    The disease was judged to be too common and too fatal to be a purely genetic disorder, unless the hypothetical kuru gene was maintained at high frequency by a mechanism of balanced polymorphism for which, at that time, there was no evidence.

    “However, the disease was judged to be too common and too fatal to be a purely genetic disorder, unless the hypothetical kuru gene was maintained at high frequency by a mechanism of balanced polymorphism for which, at that time, there was no evidence (44).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [44] Mathews JD Kuru: A Puzzle in Culture and Environmental Medicine PhD thesis University of Melbourne Melbourne, Victoria, Australia 1971

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Those who died of dysentery, leprosy, and possibly yaws were not consumed.

    “Those who died of dysentery, leprosy, and possibly yaws were not consumed”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [45] Whitfield JT Mortuary Practices, Genetics and Other Factors Relevant to the Transmission of Kuru in Papua New Guinea PhD dissertation University College London, UK 2010

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationreasoning

    Cannibalism continued longer in the south, the area with the highest incidence of kuru in the 1960s.

    “Cannibalism thus continued longer in the south, the area with the highest incidence of kuru in the 1960s.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisenone given

    The first government patrols in the late 1940s had reported cannibalism to be customary throughout much of the region.

    “The first government patrols in the late 1940s had also reported cannibalism to be customary throughout much of the region.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Initiated youths moved to the men's house at approximately age 12 years, leaving behind the world of immaturity, femininity, and cannibalism.

    “Initiated youths moved to the men’s house at approximately age 12 years, leaving behind the world of immaturity, femininity, and cannibalism.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [45] Whitfield JT Mortuary Practices, Genetics and Other Factors Relevant to the Transmission of Kuru in Papua New Guinea PhD dissertation University College London, UK 2010

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Small children were never given meat and were also kept away from the ceremony.

    “Small children were never given meat and were also kept away from the ceremony.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [45] Whitfield JT Mortuary Practices, Genetics and Other Factors Relevant to the Transmission of Kuru in Papua New Guinea PhD dissertation University College London, UK 2010

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Brain tissue mixed with wild green vegetables was cooked in bamboo tubes, which the daughters-in-law shared with other women.

    “Brain tissue mixed with wild green vegetables was cooked in bamboo tubes, which the daughters-in-law shared with other women (45).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [45] Whitfield JT Mortuary Practices, Genetics and Other Factors Relevant to the Transmission of Kuru in Papua New Guinea PhD dissertation University College London, UK 2010

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Classified as probably not a substantial claim.

    Premisenone given

    The South Fore reported that some people had continued to hide and eat deceased kin until the road reached them.

    “Nevertheless, the South Fore reported that some people had continued to hide and eat deceased kin until the road reached them.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisereasoning

    Nearby or distant Fore immigrant groups were welcomed and, in time, were said to possess "one blood" and to stem from a common ancestor.

    “Nearby or distant Fore immigrant groups were welcomed and, in time, were said to possess “one blood” and to stem from a common ancestor.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisenone given

    The Fore could name those who had died of kuru and those who had participated in the consumption of the deceased person, which allowed for an account of the appearance of the disease in particular hamlets some 4 to 20 years after ingestion.

    “Moreover, the Fore could name those who had died of kuru and those who had participated in the consumption of the deceased person, which allowed for an account of the appearance of the disease in particular hamlets some 4 to 20 years after ingestion.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Adult men in the North Fore consumed the dead more frequently than in the South, where adult men rarely ate human flesh.

    “Adult men in the North Fore consumed the dead more frequently than in the South, where adult men rarely ate human flesh”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [45] Whitfield JT Mortuary Practices, Genetics and Other Factors Relevant to the Transmission of Kuru in Papua New Guinea PhD dissertation University College London, UK 2010

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites [46] Glasse RM Lindenbaum S Kuru at Wanitabe Hornabrook RW Essays on Kuru Berks. E. W. Classey Faringdon, Oxon, UK 1976 38 52

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Female relatives by marriage, who were the main consumers, could also request certain body parts.

    “Female relatives by marriage, who were the main consumers, could also request certain body parts.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [45] Whitfield JT Mortuary Practices, Genetics and Other Factors Relevant to the Transmission of Kuru in Papua New Guinea PhD dissertation University College London, UK 2010

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    A balancing selection at the PRNP locus somewhat similar to what occurred in the Fore was discovered in some other world populations and has been interpreted as evidence of selection pressure from possible epidemics of prion diseases in prehistoric humans.

    “Surprisingly, a balancing selection at the PRNP locus somewhat similar to what occurred in the Fore was discovered in some other world populations and has been interpreted as evidence of selection pressure from possible epidemics of prion diseases in prehistoric humans (40, 41).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [40] Mead S Stumpf MP Whitfield J Balancing selection at the prion protein gene consistent with prehistoric kurulike epidemics Science 2003 300 640 43 12690204 source
    • cites [41] Hardy J Scholz S Evans W Prion genotypes in Central America suggest selection for the V129 allele Am J Med Genet B Neuropsychiatr Genet 2006 141B 33 35 16287045 source
  • May combine two claims.

    Premisecitation

    Fore genealogies gave legitimacy to ties based on culturally defined notions of kinship, providing a moral guide for living but were not reliable statements of genetic proximity.

    “Fore genealogies gave legitimacy to ties based on culturally defined notions of kinship, providing a moral guide for living but were not reliable statements of genetic proximity (42).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [42] Lindenbaum S Kuru Sorcery. Disease and Danger in the New Guinea Highlands Palo Alto, CA Mayfield Publishing Company 1979

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The duration of kuru, as measured from the onset of prodromal signs and symptoms until death, was about 12 months (range, 3-23 months).

    “The duration of kuru, as measured from the onset of prodromal signs and symptoms until death, was about 12 months (range, 3–23 months) (54, 62).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [54] Knauft BM Good Company and Violence. Sorcery and Social Action in a Lowland New Guinea Society Berkeley, CA University of California Press 1985

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites [62] Klatzo I Gajdusek DC Pathology of kuru Lab Invest 1959 8 799 847 13665963
  • May combine two claims.

    Premisenone given

    Deep reflexes were increased, but the plantar reflex was still flexor and the Babinski sign has never been seen.

    “Deep reflexes were increased, but the plantar reflex was still flexor and the Babinski sign has never been seen.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    The Romberg sign was almost always negative (2 of 34 kuru cases in Alpers' series), but with disease progression, ataxia became marked and the Romberg sign became positive.

    “The Romberg sign was almost always negative (2 of 34 kuru cases in Alpers’ series [63]), but with disease progression, ataxia became marked and the Romberg sign became positive.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [63] Alpers MP Kuru: A Clinical Study Washington, DC US Department of Health, Education, and Welfare 1964 1 38

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationreasoning

    The infectious agent was then recycled through the consumption of those who had died of the disease, amplifying the infectious agent and resulting in the epidemic.

    “The infectious agent was then recycled through the consumption of those who had died of the disease, amplifying the infectious agent and resulting in the epidemic.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationcitation

    Consumption of human flesh and exposure to the infectious agent was limited to adult women, children of both sexes, and a few adult men, matching the epidemiology of kuru in the 1960s.

    “Consumption of human flesh and exposure to the infectious agent was thus limited to adult women, children of both sexes, and a few adult men, matching the epidemiology of kuru in the 1960s (46).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [46] Glasse RM Lindenbaum S Kuru at Wanitabe Hornabrook RW Essays on Kuru Berks. E. W. Classey Faringdon, Oxon, UK 1976 38 52

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

    Premisenone given

    In the third stage, the patient was bedridden, incontinent, and covered with urine and feces, with dysphasia and primitive reflexes, and eventually succumbed in a state of severe emaciation, generalized muscle wasting, and fasciculation, spontaneous or evoked by tapping.

    “In the third stage, the patient was bedridden, incontinent, and covered with urine and feces, with dysphasia and primitive reflexes, and eventually succumbed in a state of severe emaciation, generalized muscle wasting, and fasciculation, spontaneous or evoked by tapping.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Kuru plaques were found in about three quarters of the 13 cases of Beck and Daniel.

    “in “about three quarters” of the 13 cases of Beck and Daniel (68)”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [68] Beck E Daniel PM Kuru and scrapie compared: Are they examples of system degeneration? Gajdusek DC Gibbs CJ Jr Alpers MP Slow, Latent, and Temperate Virus Infections Washington, DC US Department of Health, Education, and Welfare 1965 85 93

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Fowler et al described severe demyelination in the lateral corticospinal tract and degeneration of dorsal and ventral spinocerebellar tracts in kuru.

    “Fowler et al (67) described severe demyelination in the lateral corticospinal tract and degeneration of dorsal and ventral spinocerebellar tracts.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [67] Fowler M Robertson EG Observations on kuru. III. Pathological features in five cases Australas Ann Med 1959 8 16 26 13638205 source
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisenone given

    Kuru was divided into 3 clinical stages: ambulant, sedentary, and terminal.

    “Kuru was divided into 3 clinical stages: ambulant, sedentary, and terminal.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Intention tremor was detected in more than 50% of cases in Alpers' series in the first stage of kuru but was constantly present through the second stage.

    “Intention tremor was detected in more than 50% of cases in Alpers’ series in the first stage of kuru but was constantly present through the second stage.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [63] Alpers MP Kuru: A Clinical Study Washington, DC US Department of Health, Education, and Welfare 1964 1 38

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Swollen neurons are occasionally described in kuru.

    “Swollen neurons were occasionally described (67, 68).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [67] Fowler M Robertson EG Observations on kuru. III. Pathological features in five cases Australas Ann Med 1959 8 16 26 13638205 source
    • cites [68] Beck E Daniel PM Kuru and scrapie compared: Are they examples of system degeneration? Gajdusek DC Gibbs CJ Jr Alpers MP Slow, Latent, and Temperate Virus Infections Washington, DC US Department of Health, Education, and Welfare 1965 85 93

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    In kuru, neurons are shrunken and either hyperchromatic or pale, with dispersion of the Nissl substance or intracytoplasmic vacuoles similar to those in scrapie.

    “Neurons were shrunken and either hyperchromatic or pale, with dispersion of the Nissl substance or contained intracytoplasmic vacuoles similar to those that had been described in scrapie (66).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [66] Innes JRM Saunders LZ Comparative Neuropathology New York, NY Academic Press 1962 839

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Beck and Daniel noticed "small spongy spaces" in 7 of 13 kuru cases.

    “but “small spongy spaces” were noticed in 7 of 13 cases studied by Beck and Daniel (68).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [68] Beck E Daniel PM Kuru and scrapie compared: Are they examples of system degeneration? Gajdusek DC Gibbs CJ Jr Alpers MP Slow, Latent, and Temperate Virus Infections Washington, DC US Department of Health, Education, and Welfare 1965 85 93

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Well-documented accounts of the practice in Papua New Guinea have recently been published.

    “well-documented accounts of the practice in Papua New Guinea have recently been published (54, 55).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [54] Knauft BM Good Company and Violence. Sorcery and Social Action in a Lowland New Guinea Society Berkeley, CA University of California Press 1985

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

    • cites [55] Gillison G Between Culture and Fantasy A New Guinea Highlands Mythology Chicago, IL Chicago University Press 1993

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Premisenone given

    Spongiform change is poorly visible in thick celloidin blocks stained with Nissl stain, as opposed to paraffin blocks stained with hematoxylin and eosin.

    “It must be stressed, however, that the spongiform change is poorly visible in thick celloidin blocks stained with Nissl stain, as opposed to paraffin blocks stained with hematoxylin and eosin.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationnone given

    The discovery of transmissibility of kuru and subsequent transmission of CJD set the stage for the timely discovery of variant CJD almost 50 years later, without which its cause might have remained a mystery for a very long time.

    “Also, the discovery of transmissibility of kuru and subsequent transmission of CJD would set the stage for the timely discovery of variant CJD almost 50 years later, without which its cause might have remained a mystery for a very long time.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationnone given

    The amount of ultrastructural data on kuru-affected brains is extremely limited, probably because of severe constraints on obtaining well-fixed material.

    “The amount of ultrastructural data on kuru-affected brains is extremely limited probably because of severe constraints on obtaining well-fixed material.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Field et al. described a typical fine structure of amyloid plaques and numerous Hirano bodies in kuru brains.

    “They described a typical fine structure of amyloid plaques as well as numerous Hirano bodies.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [81] Field EJ Mathews JD Raine CS Electron microscopic observations on the cerebellar cortex in kuru J Neurol Sci 1969 8 209 24 4185060 source
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Peat and Field reported cytoplasmic lamellar bodies, which were subsequently shown to be normal cell constituents.

    “Peat and Field (82) reported on “cytoplasmic lamellar bodies,” which subsequently were shown to be perfectly normal cell constituents (83).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [82] Peat A Field EJ An unusual structure in kuru brain Acta Neuropathol (Berl) 1970 15 288 92 4988012 source
    • cites [83] Liberski PP Gibson PH Cerebellar lamellar bodies in two strains of murine scrapie J Comp Pathol 1987 97 491 93 3668000 source
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    As early as 1969, Lampert et al. suggested that spongiform change is related to autophagy.

    “It is of utmost interest that as early as 1969, Lampert et al (having cited an earlier article by Arstila et al [88]) suggested that the spongiform change is somehow related to autophagy (84).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [84] Lampert PW Earle KM Gibbs CJ Jr Experimental kuru encephalopathy in chimpanzees and spider monkey J Neuropathol Exp Neurol 1969 28 353 70 4978020 source
    • cites [88] Arstila AU Trump BF Studies on cellular autophagocytosis. The formation of autophagic vacuoles in the liver after glucagon administration Am J Pathol 1968 53 687 733 4300890 PMC2013521
  • Probably not a substantial claim: may not pass S4 (based).

    Premisenone given

    Kuru was the first slow virus disease of humans discovered in a remote tribe of Papua New Guinea.

    “Kuru was the first slow virus disease of humans discovered in a remote tribe of Papua New Guinea.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Premisenone given

    The new type of human infectious pathogen called "a slow virus" was discovered through the work of D. Carleton Gajdusek and subsequent collaborators and followers.

    “Through the insight, endurance, persistence, and genius of D. Carleton Gajdusek and subsequent collaborators and followers, the new type of human infectious pathogen, called “a slow virus,” was discovered.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    That discovery opened a new field of neurodegenerations viewed as protein conformational disorders.

    “That discovery opened a new field of neurodegenerations viewed as protein conformational disorders.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Beck et al. confirmed the pioneer data and reported membrane lamination observed before full-blown pathology could be appreciated.

    “Those pioneer data were confirmed by Beck et al (89), who also reported membrane lamination observed before full-blown pathology could be appreciated.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [89] Beck E Bak IJ Christ JF Experimental kuru in the Spider monkey: Histopathological and ultrastructural studies of the brain during early stages of incubation Brain 1975 98 595 612 814967 source
  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

    Interpretationnone given

    The histogenesis of vacuoles is not well understood, and most ultrastructural studies cannot detect the subcellular organelles from which vacuoles originate.

    “The histogenesis of vacuoles is not well understood, and most of the ultrastructural studies have an inability to detect subcellular organelles from which vacuoles originate.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S4 (based).

    Premisenone given

    With the passage of time, the slow virus concept became a "prion."

    “With the passage of time, the slow virus changed clothes to become a “prion.””
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationown data

    Our immunohistochemistry confirmed the presence of microglial cells, astrocytic processes, and dystrophic neurites at the periphery of kuru plaques and a striking resemblance of the amyloid plaques in kuru with those in the plaque subtype of sporadic CJD.

    “Our immunohistochemistry confirmed the presence of microglial cells, astrocytic processes, and dystrophic neurites at the periphery of kuru plaques and a striking resemblance of the amyloid plaques in kuru with those in the plaque subtype of sporadic CJD.”
    Quote in the paperSubstantial claim
59 of 59

Cites

Flagged first, then by citations

Research works printed but not linked: 7

  1. Bennett, 1959, Am J Hum Genet, 11, 169
  2. Gajdusek, 1972, Am J Hum Gen, 24, 1
  3. Wiesenfeld, 1975, Am J Hum Gen, 27, 498
  4. Lindenbaum, 2009, Folia Neuropathol, 47, 138
  5. Klatzo, 1959, Lab Invest, 8, 799
  6. Seitelberger, 1962, Wien Klein Wochen, 74, 687
  7. Arstila, 1968, Am J Pathol, 53, 687

Cited by

Sorted by citations

Authors
Liberski, P. P., Sikorska, B., Lindenbaum, S., Goldfarb, L. G., McLean, C., Hainfellner, J. A., & Brown, P.
Affiliations
  • Medical University of Lodz (PL)
  • The Graduate Center, CUNY (US)
  • National Institutes of Health (US)
  • The Alfred Hospital (AU)
  • University of Vienna (AT)
  • Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
Corresponding author
Liberski, Pawel P.
Venue
Journal of Neuropathology & Experimental Neurology
Published
2012-02
Volume
71
Issue
2
Pages
92-103
ISSN
0022-3069 (ISSN-L)
OpenAlex
W2081414459
Cited by
50
References
74
Citations by year
2026: 3 · 2025: 1 · 2024: 5 · 2022: 4 · 2021: 6 · 2020: 3 · 2019: 4 · 2018: 2 · 2017: 4 · 2016: 3 · 2015: 1 · 2014: 8 · 2013: 4 · 2012: 2
FWCI
1.74
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuropathology & Experimental Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion)
Funders
  • Österreichische Agentur für Internationale Mobilität und Kooperation in Bildung, Wissenschaft und Forschung
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (ZIANS002973)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Amyloidosis: Diagnosis, Treatment, Outcomes
Keywords
kuru, prion disease, Fore people, cannibalism, balancing selection, cerebellar ataxia, choreiform movements, amyloid plaques, astrocyte proliferation, glial fibrillary acidic protein, Creutzfeldt-Jakob disease, Gerstmann-Sträussler-Scheinker disease, variant Creutzfeldt-Jakob disease, experimental transmission
MeSH terms
Brain, Cannibalism, Glial Fibrillary Acidic Protein, Humans, Creutzfeldt-Jakob Syndrome, Kuru, Prions, Gerstmann-Straussler-Scheinker Disease

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-17.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-17.

Cited sources are checked by gpt-6-sol.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

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