Human H1N1 HA sequences with residue 89 in HA2 in database (www.fludb.org/brc/home.do?decorator=influenza) were compared for the evolutionary changes of residue 89. *: Except M89 in A/Denver/1/1957 HA
Since its first isolation in around 2007, the avian-origin H3N2 canine influenza virus (CIV) has become established and continues to circulate in dog populations. This virus serves as a useful model f
Estimates of evolutionary divergence for representative amino acid sequences between influenza A virus HA subtype lineages from the past (≤1989) and present (≥2009). Distances represent the average pa
