The prevalence of South American Blastomycosis (S.A.B.), had not been studied in rural areas of the State of São Paulo (Brazil) where it is suposed to be endemic. In a S.A.B. skin test survey made in 408 persons living in rural areas around Botucatu we had 13% of positive results. No sex or race differences are observed, however positive results were more frequent in older residents of the area. Persons with positive skin test were submited to examination and none of them had any clinical or roentgenological signs sugestive of S.A.B., from there 29 persons only 13.8% had positive complement fixation for S.A.B.
South-American Blastomycosis; Epidemiological survey; Paracoccidioidin skin-test
