On the Origin of the H1N1 (A/USSR/90/77) Influenza Virus

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Abstract
The influenza virus H1N1 (A/USSR/90/77 strain) that reappeared in 1977 after the H1N1 influenza viruses had disappeared from the human population is compared with the A/Fort Monmouth/1/47 and the A/Fort Warren/1/50 influenza viruses by the method of oligonucleotide mapping of individual segments of the viral RNA. Seven genes of the A/USSR/90/77 virus appear to be very similar to the corresponding genes of the A/Fort Warren/1/50 virus; the gene coding for the M protein displays considerable homology to the corresponding gene of the A/Fort Monmouth/1/47 virus. The A/USSR/90/77 strain appears to be a recombinant virus.