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- Suarez, David L.; Perdue, Michael L.
- Virus research 1998 v.54 no.1 pp. 59
- Influenza A virus; phylogeny; humans; swine; horses; birds
- ... One hundred and six influenza A virus isolates were compared phylogenetically using gene segment 8 which encodes the two non-structural (NS) proteins, NS1 and NS2. The isolates separated into two previously described subtypes, A and B. For non-structural gene subtype A viruses, five subdivisions were distinguished in the nucleotide phylogenetic tree including a human-swine group, American avian-eq ...