Abstract

Fifteen antigenically related virus strains isolated in 1969–1971 fromIxodes putus ticks at a seabird colony (Uria aalge) of the south-east coast of Sakhalin Island, Sea of Okhotsk, were studied. Sakhalin virus was shown to be a RNA-containing virus, sensitive to ether and sodium deoxycholate, pathogenic for infant mice after intracerebral inoculation. The virus did not agglutinate goose erythrocytes. No antigenic relations were detected in the complement-fixation test neither with group A and B arboviruses (Uukuniemi, Kemerovo, California, Quaranfil, Kaisodi, Crimean hemorrhagic fever, Hughes viruses), nor with ungrouped Bhanja and Naymanini viruses and Colorado tick fever virus. Replication of Sakhalin virus was demonstrated in experimentally infected Culex molestus mosquitoes. Complement-fixing antibodies were found in 9% ofUria aalge, but not inLarus schistisagus, Oceanodroma leucorrhoa, Phalacrocorax pelagicus, Aythia nyroca, Anas crecca andArenaria interpres.

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