Volume 12, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



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 and spp., and the 11 strains of Una from and 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.


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