ABSTRACT
A revision of the malacological surveys carried out in Santa Catarina, Brazil, by the National Health Foundation in 52 counties of 8 microregions between 1981 and 1994 was made. Fifty of them were positive for Biomphalaria tenagophila, the only schistosome vector identified in the 94,535 specimens collected. Of 1,358 districts, 617 (45.4 per cent) were positive to the vector, varying from 4.3 per cent to 89.4 per cent per municipality. The percentages of water bodies with planorbids varied from 0.2 per cent to 26.3 per cent and, of the total 28,120 examined 2,013 (7.1 per cent) were positive. Snails infected with cercariae of Schistosoma mansoni were found in the counties of Araquari, Massaranduba, Joinville, Jaraguá do Sul and Säo Francisco do Sul, the last two constituting the southernmost focus of schistosomiasis mansoni in Brazil. Other planorbid species identified were B. peregrina, B. oligoza, B. schrammi, B. straminea and B. occidentalis.