An outbreak of acute Schistosoma mansoni Schistosomiasis in a nonendemic area of Brazil: a report on 50 cases, including 5 with severe clinical manifestations.

Background: Acute schistosomiasis is a systemic hypersensitivity reaction against the migrating schistosomula and eggs. In this report, we describe an atypical outbreak of the disease with severe cases. Transmission occurred in a nonendemic area of Brazil, which became a new focus of transmission due to the in-migration of infected workers.