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Eight strains of a flavivirus identified as St. Louis encephalitis (SLE) virus were isolated from wild rodents, birds, and sentinel mice in three locations in the State of São Paulo, Brazil from 19671969. No illness attributable to SLE virus infection was detected among the local inhabitants, although about 5% of the local population had neutralizing antibodies to this virus.
Accepted for publication November 18, 1978.
* Address reprint requests to: Dr. Oscar de Souza Lopes, Seção de Virus Transmitidos por Artropodos, Instituto Adolfo Lutz, Caixa Postal 7027, São Paulo, Brazil.
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