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Evaluation of two Methods for the Detection of Schistosoma mansoni Cercariae Shed by Biomphalaria Glabrata^*

A simple sedimentation technique for detecting cercariae of Schistosoma mansoni shed by infected snails proved as reliable as a more complicated filtration technique, both in the laboratory and in the field. It was therefore considered suitable for routine use in a schistosomiasis control program in Puerto Rico and has been used satisfactorily for more than a year.

Accepted for publication October 15, 1970.

^* From the Tropical Disease Section, San Juan Laboratories, Ecological Investigations Program, National Communicable Disease Center, Health Services and Mental Health Administration, Public Health Service, U.S. Department of Health, Education, and Welfare, Box 52, Old San Juan, Puerto Rico 00902. Please address requests for reprints to Dr. Frederick F. Ferguson.