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Aura and Una, Two New Group a Arthropod-Borne Viruses^*

Two hitherto unknown viruses, for which the names Aura and Una are proposed, have been isolated 14 times from mosquitoes collected in forested areas near Belém, Brazil, during 1959 to 1961. The three strains of Aura were obtained from Culex and Aedes spp., and the 11 strains of Una from Psorophora and Aedes spp. Aura has been shown to be immunologically related to Sindbis and western equine encephalitis viruses and Una to Mayaro and AMM 2021 viruses, all of group A. Three strains of Una virus have also been isolated in Trinidad. A small percentage of sera from residents of the Amazon Valley show HI and neutralizing antibodies against Una. The forest vertebrate hosts of these two viruses are unknown.

^* The studies and observations on which this paper is based were conducted with the support and under the auspices of the Serviço Especial de Saúde Pública of Brazil and The Rockefeller Foundation.

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