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Human water contacts patterns in Schistosoma mansoni epidemic foci in northern Senegal change according to age, sex and place of residence, but are not related to intensity of infection

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Show simple item record Scott, J. T. en_US Diakhaté, M. en_US Vereecken, K. en_US Fall, A. en_US Diop, M. en_US Ly, A. en_US De Clercq, D. en_US de Vlas, S. J. en_US Berkvens, D. en_US Kestens, L. en_US Gryseels, B. en_US 2007-12-06T14:34:06Z 2007-12-06T14:34:06Z 2003 en_US
dc.identifier.issn 1360-2276 en_US
dc.identifier.other ITG-P1A en_US
dc.identifier.other ITG-P3B en_US
dc.identifier.other ITG-A9A en_US
dc.identifier.other ITG-M10A en_US
dc.identifier.other ITG-PLA en_US
dc.identifier.other PARAS en_US
dc.identifier.other DOI en_US
dc.identifier.other ANIMAL en_US
dc.identifier.other U-ANIMAL en_US
dc.identifier.other MULTI en_US
dc.identifier.other ABSTRACT en_US
dc.identifier.other FTB en_US
dc.identifier.other JIF en_US
dc.description The definitive version is available at
dc.description.abstract In an epidemic focus in northern Senegal, adults had lower intensities of infection than adolescents, a phenomenon that could not be attributed to immunity acquired over the previous 10–15 years of exposure to the parasite because all age groups had had the same number of years' experience of the worm. This article considers whether this pattern could have been because of higher levels of exposure to the parasite in younger age groups. Personal contact with infected water was recorded using a questionnaire in Schistosoma mansoni foci not more than 3 years old and in another, 10-year-old focus. Many aspects of contact (e.g. frequency, duration or time of day of contact) may contribute to the number of encounters with infective cercariae (true exposure), so various assumptions regarding the relationship between water contact and true exposure were tested resulting in a range of exposure indices. People reported a mean of 4.4 separate contacts, and spent a median of 57 min per day in water. Patterns of water contact differed depending on the exposure index used, e.g. considering duration, males spent a longer time in water than females (P < 0.001). But using frequency, females had more contacts with water than males in most villages (P < 0.001). Generally, exposure levels dropped as people become aged (P < 0.001) and residents of the older focus were more exposed than residents of other foci (P < 0.002). Intensity of (re)infection was not related to exposure either alone or in models incorporating age, sex and/or village irrespective of the index used. There is therefore evidence that age, sex and place of residence determine exposure but none to suggest that exposure had an influence on the relationship between these factors and intensity of infection. We propose therefore that in this population other factors have principal importance in determining intensity of infection.
dc.language English en_US
dc.publisher Blackwell Publishing
dc.subject Schistosomiasis en_US
dc.subject Helminthic diseases en_US
dc.subject Schistosoma mansoni en_US
dc.subject Exposure en_US
dc.subject Water contact en_US
dc.subject Age factors en_US
dc.subject Gender en_US
dc.subject Regional differences en_US
dc.subject Infection rates en_US
dc.subject Senegal en_US
dc.subject Africa, West en_US
dc.title Human water contacts patterns in Schistosoma mansoni epidemic foci in northern Senegal change according to age, sex and place of residence, but are not related to intensity of infection en_US
dc.type Article en_US
dc.citation.issue 2 en_US
dc.citation.jtitle Tropical Medicine and International Health en_US
dc.citation.volume 8 en_US
dc.citation.pages 100-108 en_US Oxford
dc.citation.jabbreviation Trop Med Int Health en_US

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