Figure 3
From: Assessment of exposure to influenza A viruses in pigs between weaning and market age
Phylogenetic tree of the HA gene nucleotide sequences of H3N2 viruses in the longitudinal study during nursery phase. The isolated H3N2 viruses in Study 1 belong to cluster IV (in blue) (In descending orders starting with A/SW/ON/81-5/14/H3N2/HA and ending with A/SW/ON/17-4/14/H3N2/HA). Viruses used as reference strains in the hemagglutinin inhibition (HI) assay are labeled in red italicized font with asterisk, including one of the viruses isolated in the Study 1. Labels of the study viruses (e.g. A/SW/ON/81-5/14/H3N2/HA) contain unique pig identifier (e.g., 81 in the latter example), and sampling occasion (e.g., occasion 5 in the latter example). Pigs 17, 23, 50, 72, 81 had viruses sequenced on more than one occasion.