Abstract
1. (1) Pollution of the habitat of fresh-water snails by temporary discharge from the sewer serving an urban Native housing site is shown to be the cause of a -high incidence of infection in the snail Biomphalaria pfeifferi. 2. (2) Of these snails 21 per cent. were infected at the polluted locality against less than 1 per cent. in snails from other sites. 3. (3) The implications are discussed and the suggestion is made that the progressive deterioration of perennial flow of South African rivers favours an increasing incidence of S. mansoni infection in the future.
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