EMERGENCE OF A NEW ARBOVIRUS DISEASE IN BRAZIL

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Abstract
Lopes O. S. L. A. Sacchetta, D. B. Francy (Vector-Borne Diseases Div., CDC, P.O. Box 2087, Fort Collins, CO 80522), W. L. Jakob and C. H. Calisher. Emergence of a new arbovirus disease In Brazil. III. Isolation of Rocio virus from Psorophora ferox (Humboldt, 1819). Am J Epidemiol 1981;113:122–5. A newly described flavlvlrus was responsible for a large encephalitis epidemic in Sao Paulo State, Brazil. The etiologic agent, Rocio virus, was isolated from human patients and sentinel mice. The natural history of the virus is unknown although presumed to be arthropod-borne. Rocio virus was isolated from a single pool containing 19 Psorophora ferox of 47 pools (283 specimens) of this species tested. The positive pool contained 16 deplete, 2 gravid, and 2 engorged mosquitoes. No Isolations were made from 2183 pools of other species. The positive pool was collected during the year of the epidemic at the same approximate time and place where vertebrate isolations were made.

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