Variations in egg size ofTrichuris trichiura
Abstract
In patients infected with Trichuris trichiura, large eggs as well as more typical eggs were frequently found in the feces; these large eggs have been attributed to human infection by T. vulpis. To clarify whether the female worms laying the large eggs were T. trichiura or T. vulpis, we examined the morphology of adult worms and the size of whipworm eggs obtained from a patient and from several domestic dogs. Adult female T. trichiura worms were easily and quickly distinguished from those of T. vulpis by their convoluted vaginal tracts and uteri. Eggs obtained from the uteri of T. trichiura were of two sizes, with approximately 80% being of the smaller variety (57 X 26 microns) and 20%, the larger (78 X 30 microns). These percentages were about equal to those found the feces of the patient. T. vulpis uterine eggs were slightly larger (82 X 39 microns) than the large eggs of T. trichiura. The distribution of the 2 populations of eggs in 30 adult female T. trichiura was as follows: 1 worm had only large eggs, 14 had only the typical smaller eggs, and 15 had both varieties in their uteri.
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Adult worms recovered from patients with presumed T. vulpis infection have been identified as actually T. trichiura shedding abnormal eggs.
“adult worms recovered from patients with presumed T. vulpis infection have been identified to be actually T. trichiura shedding abnormal eggs”
From Are we paying too much attention to cardio-pulmonary nematodes and neglecting old-fashioned worms like Trichuris vulpis? (2011) · cites this paper as [17]
Apart from one old study, the actual potential of dog whipworms to produce patent intestinal infections in human beings is uncertain and still to be definitively established.
“the actual potential of dog whipworms to produce patent intestinal infections in human beings, at the moment, has to be considered uncertain and still to be definitively established [16,17,21,23,24,27].”
From Are we paying too much attention to cardio-pulmonary nematodes and neglecting old-fashioned worms like Trichuris vulpis? (2011) · cites this paper as [17]
T. vulpis eggs are nearly twice as large as T. trichiura eggs.
“the main barrier is the size differences between the eggs of the two species, those of T. vulpis being nearly twice as large as those of the human whipworm [17,22].”
From Are we paying too much attention to cardio-pulmonary nematodes and neglecting old-fashioned worms like Trichuris vulpis? (2011) · cites this paper as [17]
Few cases of presumed human infection by T. vulpis have been described.
“Overall, few cases of presumed human infection by T. vulpis have been described (see [17,18]).”
From Are we paying too much attention to cardio-pulmonary nematodes and neglecting old-fashioned worms like Trichuris vulpis? (2011) · cites this paper as [17]
T. vulpis eggs can be bigger than regular eggs.
“and that also T. vulpis eggs can be bigger than regular eggs [17,21].”
From Are we paying too much attention to cardio-pulmonary nematodes and neglecting old-fashioned worms like Trichuris vulpis? (2011) · cites this paper as [17]
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Traversa, D. (2011) · Parasites & Vectors · doi:10.1186/1756-3305-4-32 · Cited by 148 · see citing works
- Authors
- Yoshikawa, H., Yamada, M., Matsumoto, Y., & Yoshida, Y.
- Affiliations
- Kyoto Prefectural University of Medicine (JP)
- Venue
- Parasitology Research
- Published
- 1989
- Volume
- 75
- Issue
- 8
- Pages
- 649-654
- ISSN
- 0044-3255 (ISSN-L)
- 1432-1955
- OpenAlex
- W2068734122
- Cited by
- 56
- References
- 13
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 4 · 2022: 2 · 2021: 4 · 2020: 3 · 2019: 3 · 2018: 5 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 4 · 2013: 2 · 2012: 4
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Parasitology Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Immunology and Microbiology › Parasitology › Parasites and Host Interactions
- Health Sciences › Veterinary › Small Animals › Helminth infection and control
- Health Sciences › Medicine › Infectious Diseases › Parasitic Diseases Research and Treatment
- Keywords
- Trichuris trichiura, Trichuris vulpis, egg size variation, uterine eggs, uterine morphology, co-infection, dogs as definitive hosts
- MeSH terms
- Adolescent, Animals, Dogs, Female, Humans, Larva, Male, Ovum, Species Specificity, Trichuris, Uterus, Vagina
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