The influenza epidemic occurring in Minsk in the autumn of 1986 was caused by at least two drift variants of influenza A virus (H1N1 subtype) differing in two antigenic determinants of hemagglutinin from the viruses isolated in previous years (A/USSR/90/77, A/Dunedin/6/83). One of the epidemic drift variants was found to be identical in the antigenic properties of hemagglutinin with the reference A/Taiwan/1/86 virus.
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