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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 by J. T. Scott; M. Diakhaté; K. Vereecken; A. Fall; M. Diop; A. Ly; D. De Clercq; S. J. De Vlas; D. Berkvens; L. Kestens; B. Gryseels is a Medicine article available to read on EtoBox.

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## Summary 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 frequen

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Author

J. T. Scott; M. Diakhaté; K. Vereecken; A. Fall; M. Diop; A. Ly; D. De Clercq; S. J. De Vlas; D. Berkvens; L. Kestens; B. Gryseels

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; ScienceOpen (ISSN 1360-2276)

Published

2003

Language

EN

Field

Medicine (Health Sciences)