Figure 1.

(A) Map of South America showing the study site region (indicated by a cross) and the geographic provenance of the three viruses (indicated by stars) which clustered most closely on phylogenetic analysis with the viruses obtained from swine in Tumbes. (B) Map of the Tumbes region, Peru, showing sites of backyard farms with pigs positive for antibody to influenza A(H1N1)pdm09 virus during the peak pandemic period (black circles), the 1st post‐pandemic period (blue circles), and during the 2nd post‐pandemic pandemic period (red circles).