caa a22 4500 386400415 CHVBK 20180307112156.0 cr unu---uuuuu 161130e198912 xx s 000 0 eng 10.1017/S0031182000059060 doi S0031182000059060 pii (NATIONALLICENCE)cambridge-10.1017/S0031182000059060 A comparative evaluation of snail sampling and cercariometry to detect Schistosoma mansoni transmission in a large-scale, longitudinal field-study in Machakos, Kenya [Elektronische Daten] In an operational Schistosoma mansoni field-study in an area of about 20 km (population approximately 8000), transmission detection by simple snail sampling was compared with cercariometry. Between 1985 and 1987, 62 field sites were sampled at fortnightly intervals. Of a total of 2758 field observations, 89.8% gave full snail data; 64.4% full cercarial data; and 61.7% complete data for both methods. The complete data sets showed significant but not strong correlations between Biomphalaria pfeifferi (total and infected with S. mansoni or other trematodes) and cercarial (S. mansoni and non-human) recoveries. Non-human (but not S. mansoni) cercarial recovery decreased with deteriorating cercariometry filter quality. Both snail and cercarial recoveries diminished significantly with increasing water flows at the time of collection. Many samples yielded infected snails or cercariae, but not both, and neither method detected significantly more transmission sites. The method of choice for detecting transmission in a large-scale field-study depends on logistical and financial considerations. Relatively simple snail sampling allows quick, cheap and widespread data collection adequate for most purposes but more complicated cercariometry is still valuable for specific, small-scale studies. Copyright © Cambridge University Press 1989 Schistosoma mansoni nationallicence cercaria nationallicence snail nationallicence transmission nationallicence Ouma J. H. Division of Vector-borne Diseases, Ministry of Health, P.O. Box 20705, Nairobi, Kenya Sturrock R. F. Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, Keppel Street (Gower Street), London WC1E 7HT, England Klumpp R. K. 147 Laurel Street, Atherton, California 94025, USA Kariuki H. C. Division of Vector-borne Diseases, Ministry of Health, P.O. Box 20705, Nairobi, Kenya Parasitology Cambridge University Press 99/3(1989-12), 349-355 0031-1820 99:3<349 1989 99 PAR https://doi.org/10.1017/S0031182000059060 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0031182000059060 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ouma J. H. Division of Vector-borne Diseases, Ministry of Health, P.O. Box 20705, Nairobi, Kenya NATIONALLICENCE 700 1- Sturrock R. F. Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, Keppel Street (Gower Street), London WC1E 7HT, England NATIONALLICENCE 700 1- Klumpp R. K. 147 Laurel Street, Atherton, California 94025, USA NATIONALLICENCE 700 1- Kariuki H. C. Division of Vector-borne Diseases, Ministry of Health, P.O. Box 20705, Nairobi, Kenya NATIONALLICENCE 773 0- Parasitology Cambridge University Press 99/3(1989-12), 349-355 0031-1820 99:3<349 1989 99 PAR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge