Cited by 193Parasitic Diseases Research and TreatmentHelminth infection and controlResearch on Leishmaniasis Studies

The prevalence of Dirofilaria immitis and D. repens in the Old World

Genchi, Claudio, Kramer, Laura Helen·2020·Veterinary Parasitology

Abstract

Dirofilaria immitis and D. repens are endemic throughout Europe and southern eastern regions of Asia and reported with increasing frequency in Africa. Nevertheless, the increased awareness of veterinary practitioners, even in countries where the prevalence is low, has led to a decrease D. immitis prevalence in dogs, especially in previously endemic/hyper-endemic areas. Prevalence has significantly increased, however, in areas where heartworm has apparently spread more recently, such as Central and North Eastern Europe. Furthermore, autochthonous cases have been observed in Siberia. Low seroprevalence has been reported in Croatia, while in Romania it has reached 14%. In Greece, the prevalence ranges between 0.7% and 25% whilst in Turkey is 0-18%. Data for canine dirofilariosis in Africa is scarce, and most are case reports. Overall, the dominant species is Achanthocheilonema dracunculoides, although both D. immitis and D. repens have been reported from some countries. In the Far East, the prevalence ranges from 2% to 15% in northeastern of China. In Hong Kong a novel species has been found in dogs and humans (Candidatus Dirofilaria hongkongensis). In India, the prevalence ranges from 4.7%-29.5% in Northeastern states. The main factors that have influenced the spreading of Dirofilaria infections are the climate changes and the introduction of new, invasive, competent mosquito species such as Aedes albopictus and Ae. koreicus. Other factors include relocation and insufficient prevention in dogs, manly in the new areas of colonization. Feline heartworm infection has been diagnosed in every European country when diagnosed either by the Knott test or by serology for circulating antibodies and antigens of the parasite. However, prevalence is much lower than in dogs. In spite of the continuing spreading of heartworm infection, D. repens is the main concern in Europe, mostly for physicians, while the infection is nearly always asymptomatic in dogs. The infection is spreading from Portugal to the Southeastern regions of Finland and Siberia, and in some areas its prevalence overlaps that of D. immitis. Many reasons make more difficult the control of D. repens than D. immitis: the frequent lack of clinical symptoms of suspicion, the specific diagnosis being possible only by blood examination and the inefficacy of some macrocyclic lactones.

Integrity signals

Registry

Crossref · 10.1016/j.vetpar.2019.108995

Cites

67 of 67 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Few studies have jointly examined additional host and environmental variables-such as age, sex, breed, or habitat-in relation to realized transmission risk.

    “Despite the substantial body of knowledge on the epidemiology of D. immitis in Spain and Portugal, few studies have jointly examined additional host and environmental variables—such as age, sex, breed, or habitat—in relation to realized transmission risk (6, 7).”
  • Heartworm disease is an endemic disease that is continuously expanding in the European continent from the southern countries to the centre and north.

    “Heartworm disease is an endemic disease that is continuously expanding in the European continent from the southern countries, traditionally endemic, to the centre and north of the continent”

    From Expansion of canine heartworm in Spain (2022) · cites this paper as [5]

  • Spain and Portugal have traditionally been considered endemic countries for heartworm, although not all regions of those countries have been studied.

    “Spain and Portugal have traditionally been considered endemic countries, although not all regions of those countries have been studied [4].”
  • In endemic areas such as Europe, feline heartworm prevalence is estimated to be between 5 and 20% of canine prevalence in the same region.

    “For this reason, it is estimated that in endemic areas, such as Europe, the feline prevalence is between 5 and 20% of the canine prevalence in that same region [4].”
  • In Greece, there has been an increase in the number of areas analysed in recent years, with reported canine heartworm prevalences in urban cities of Thessaloniki, Larissa, Achaia, Attica, and Heraklion of 14, 7, 5.3, 0.7, and 0%, respectively, and 0.5% on the islands of Skiathos, Tinos, Ios, and Santorini.

    “In Greece, there has been an increase in the number of areas analysed in the recent years [4]. The reported prevalence in the urban cities of Thessaloniki, Larissa, Achaia, Attica, and Heraklion were 14, 7, 5.3, 0.7, and 0%, respectively. On the islands of Skiathos, Tinos, Ios, and Santorini, the reported prevalence was 0.5%.”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Genchi, C., & Kramer, L. H.
Affiliations
  • University of Milan (IT)
  • University of Parma (IT)
Corresponding author
Genchi, Claudio
Venue
Veterinary Parasitology
Publisher
Elsevier BV
Published
2020-04
Volume
280
Pages
108995
ISSN
0304-4017 (ISSN-L)
OpenAlex
W2989855055
Cited by
187
References
67
Citations by year
2026: 29 · 2025: 42 · 2024: 26 · 2023: 29 · 2022: 29 · 2021: 21 · 2020: 11
FWCI
2.13
Type
journal article
Language
en
Open access
closed
Locations
  • Veterinary Parasitology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Parasitic Diseases Research and Treatment
  • Health Sciences › Veterinary › Small Animals › Helminth infection and control
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Research on Leishmaniasis Studies
Keywords
Dirofilaria immitis, Dirofilaria repens, canine heartworm disease, feline heartworm infection, prevalence, invasive mosquito species, Aedes albopictus, Aedes koreicus, climate change, disease spread, seroprevalence, macrocyclic lactones, Old World
MeSH terms
Africa, Animals, Asia, Cat Diseases, Cats, Dirofilaria immitis, Dirofilariasis, Dog Diseases, Dogs, Europe, Prevalence, Dirofilaria repens

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.

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.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review