A new neurotropic virus has been isolated from wild-caught mosquitoes captured in the vicinity of Ilhéus, in the State of Baía, Brazil. This virus is lethal for mice. It causes immunization, so far without any sign of illness, in man. It is transmitted by mosquitoes of the species Aedes aegypti, Aedes serratus and Psorophora ferox. It is serologically specific.

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The work on which these observations are based was done under the auspices of the Serviço de Estudos e Pesquisas sôbre a Febre Amarela (Yellow Fever Research Service) which is maintained jointly by the Ministry of Education and Health of Brazil and the International Health Division of The Rockefeller Foundation.

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