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Title: The Relative Influence of Polyparasitism, Environment, and Host Factors on Schistosome Infection
Other Titles: The American Society of Tropical Medicine and Hygiene
Authors: Silva, Rita de Cássia Ribeiro
Barreto, Mauricio Lima
Assis, Ana Marlucia de Oliveira
Santana, Mônica Leila Portela de
Parraga, Isabel M.
Reis, Mitermayer Galvão
Blanton, Ronald Edward
Issue Date: 2007
Abstract: Where prevalence of geohelminths and schistosomes is high, co-infections with multiple parasite species are common. Previous studies have shown that the presence of geohelminths either promotes or is a marker for greater prevalence and intensity of Schistosoma mansoni infections. Some of this apparent synergy may simply represent shared conditions for exposure, such as poor sanitation, and may not suggest a direct biologic interaction. We explored this question in a study of 13,279 school children in Jequié, Bahia, Brazil, with a survey of demographic characteristics and stool examinations. Cross-sectional analysis revealed a statistically significant increase in the prevalence and intensity of S. mansoni infection with increasing numbers of geohelminth species (OR 2.5, 95% CI 1.38–3.64). Less than 20% of the strength of this association was contributed by socioeconomic status or environmental conditions. Thus, polyparasitism itself, as well as intrinsic host factors, appears to produce greater susceptibility to additional helminth infections.
URI: http://www.repositorio.ufba.br/ri/handle/ri/1749
ISSN: 0002-9637
Appears in Collections:Artigos Publicados em Periódicos (Nutrição)
Artigos Publicados em Periódicos Estrangeiros (ISC)

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