Measuring exposure to SCHISTOSOMA JAPONICUM in China: III. Activity diaries, snail and human infection, transmission ecology and options for control

Li, Y., Sleigh, A. C., Williams, G. M., Ross, A. G. P., Tanner, M., Li, Y. S., Forsyth, S. J. and McManus, D. P. (2000) Measuring exposure to SCHISTOSOMA JAPONICUM in China: III. Activity diaries, snail and human infection, transmission ecology and options for control. Acta Tropica, 75 3: 279-289. doi:10.1016/S0001-706X(00)00056-5


Author Li, Y.
Sleigh, A. C.
Williams, G. M.
Ross, A. G. P.
Tanner, M.
Li, Y. S.
Forsyth, S. J.
McManus, D. P.
Title Measuring exposure to SCHISTOSOMA JAPONICUM in China: III. Activity diaries, snail and human infection, transmission ecology and options for control
Journal name Acta Tropica   Check publisher's open access policy
ISSN 0001-706X
Publication date 2000-05-31
Sub-type Article (original research)
DOI 10.1016/S0001-706X(00)00056-5
Volume 75
Issue 3
Start page 279
End page 289
Total pages 11
Place of publication Amsterdam
Publisher Elsevier
Language eng
Subject C1
320405 Medical Parasitology
730101 Infectious diseases
Abstract We used activity diaries and snail detection to relate water contact and Schistosoma japonicum infection among a cohort of 178 residents on two islands in the Dongting Lake, China. Water exposure to each of 12 mapped water zones around the islands was calculated (m2 min/day) for each subject. Infected Oncomelania hupensis hupensis snails in this area are focal and were found in only five of the 12 zones, with the highest rate being 5.7%. Thirty- one subjects (17%) were re-infected with a mean intensity of 63.2 epg. Mean water contact was 7.9 m2 min/day; 98% of water exposure was due to economic activity and only 2% due to swimming or bathing, washing and other necessities of daily life. Males had more exposure and infection than females (P < 0.05). Infected subjects had more exposure (10.2 m2 min/day) than those not infected (7.44 m2 min/day) (P < 0.05). Compared with uninfected subjects, those infected had 2.9 times more exposure in infected-snail zones (P < 0.01). Also, human infection intensity (epg) correlated well with exposure to infected snail zones (r = 0.552, P < 0.01). People < 20 years old had the highest re-infection (21.4%) and intensity (3.77 epg). Median exposure for 20-49-year-olds (9.00 m2 min/day) was nearly double that of those aged < 20 or > 50 years old (5.5 m2 min/day). We conclude that map- referenced water contact and snail evaluation boosts accuracy of activity- diary measurements in large transmission foci for the Asian schistosome. Protecting against faecal contamination of snail inhabited sites, and against occupational exposure for island residents, should be a priority of future research. Potential strategies for migrating buffaloes and families living on visiting fishing boats are explored. (C) 2000 Elsevier Science B.V.
Keyword Activity diaries
China
Oncomelania
Schistosoma japonicum
Schistosomiasis control
Snails
Water exposure
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Public Health Publications
 
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Created: Tue, 10 Jun 2008, 21:32:18 EST