Fig. 1
From: Effect of herd size on subclinical infection of swine in Vietnam with influenza A viruses
Gene constellations of the IAV-S identified. Gene segments derived from A(H1N1)pdm09 viruses are represented as gray squares; those from enzootic strains are represented as stippled (North American triple-reassortant IAV-S), black (human, seasonal, H1 origin), and white (human, seasonal, H3 origin) squares. PB2, polymerase gene 2; PB1, polymerase gene 1; PA, polymerase gene A; HA, hemagglutinin gene; NP, nucleoprotein gene; NA, neuraminidase gene; M, matrix gene; and NS, non-structural gene. The numbers of the isolates in each genotype are indicated in the rightmost column. Asterisks indicate the novel genotypes found in this study