Abstract
In 1969–1971 nine virus strains were isolated fromIxodes putus ticks and were shown to be antigenically related to Kemerovo virus by complement-fixation tests. By neutralization tests, no antigenic relations were revealed. Five virus strains were isolated on Tyuleniy island, Sakhalinsk region (1969–1971); three virus strains on Ariy Kamen' rock in the vicinity of the Pacific coast of Bering island, Commodore islands, Kamchatsk region (1970–1971) and one on the South-Eastern coast of Chukotka, Magadansk region (1971). The isolated virus was named after the place of its first isolation, the sea of Okhotsk. A serological survey of 1066 birds in the Far East indicated their active role in circulation of the virus, since complement-fixing antibodies were found in 3.9 per cent ofUria aalge (common murres), 14.6 per cent ofFulmarus glacialis (fulmars) and 0.7 per cent ofPhalacrocorax pelagicus (pelagic cormorants).
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