ARBOVIRUS ISOLATIONS FROM MOSQUITOES COLLECTED IN WAYCROSS, GEORGIA, 1963, DURING AN OUTBREAK OF EQUINE ENCEPHALITIS1

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Abstract
Mosquitoes were collected at Waycross, Georgia, August-October, 1963, during and following an outbreak of equine encephalitis. From these, 167 isolations of five different arboviruses were made as follows: 35 of eastern encephalitis (EE) virus, 15 of western encephalitis (WE) virus, 42 of Tensaw virus, 31 of Flanders virus and 44 of Keystone virus (California arbovirus group). Thirty-two of the EE virus strains and all of the WE and Flanders virus strains were from Culiseta melanura. All but six of the Tensaw virus isolations were from Anopheles crucians and Psorophora confinnis, and all of the Keystone strains were from Aedes atlanticus. Although Culiseta melanura was circumstantially involved in the outbreak, no proof of its feeding upon horses in the area was obtained. Aedes atlanticus was also a suspect EE virus vector.

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