Figure 3.

Neighbor‐net dendrogram of (a) hemagglutinin (HA) and (b) neuraminidase (NA) genes of swine and human Brazilian isolates, indicated by gray filled squares. The HA and NA gene sequences of human and swine pandemic H1N1 viruses isolated previously were included in the analysis and are indicated by black circles. Numbers 1–20 indicate swine isolates; the human isolate is indicated as number 21 and highlighted with an open square; gray squares with black border = Brazilian isolates identical to other reference sequences; pH1N1: reference strains for human pandemic H1N1; pH1N1swine: reference strains for swine pandemic H1N1.