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Aggregation in schistosomiasis: comparison of the relationships between prevalence and intensity in different endemic areas
- Source :
- Parasitology. 109:45-55
- Publication Year :
- 1994
- Publisher :
- Cambridge University Press (CUP), 1994.
-
Abstract
- SUMMARYDistributions of the intensities of helminth infections within their host populations are invariably aggregated. In the case of the intestinal nematodes, the degrees of aggregation have been shown to be species specific, and constant for any given species despite geographical variation in study sites. This species-specific aggregation can be quantified and used as a tool in planning control interventions. One practical application is that the prevalence of infection can be used to predict the prevalence of heavy infection and thus the risks of morbidity. This paper investigates the patterns of aggregation in schistosome egg counts in different endemic areas in Africa (data sets were obtained from Burundi, Cameroon, Tanzania, Zambia and Zaire). The analysis demonstrates that the degree of parasite aggregation, for both Schistosoma mansoni and S. haematobium, differs amongst the different study localities. This is probably due to area-specific differences in host exposure and immunity. This implies that for these schistosome species, it is not possible to predict egg count distributions or morbidity levels from prevalence data alone.
- Subjects :
- Adolescent
Helminthiasis
Zoology
Schistosomiasis
Urine
Biology
Feces
Schistosomiasis haematobia
parasitic diseases
Prevalence
medicine
Parasite Egg Count
Animals
Cluster Analysis
Humans
Child
Schistosoma
Schistosoma haematobium
Models, Statistical
Ecology
Schistosoma mansoni
medicine.disease
biology.organism_classification
Schistosomiasis mansoni
Infectious Diseases
Tanzania
Africa
Animal Science and Zoology
Parasitology
Trematoda
Subjects
Details
- ISSN :
- 14698161 and 00311820
- Volume :
- 109
- Database :
- OpenAIRE
- Journal :
- Parasitology
- Accession number :
- edsair.doi.dedup.....c3e06ec9bec5d88571583fd44ce06a3a