† The nine IAV isolated in 9-to-11-day-old specific-pathogen-free (SPF) chicken embryos.

Figure 1. Geographical distribution of the backyard farms in Lerma, State of Mexico (n=9). Yellow circles indicate the poultry farms, red circles show poultry and pig farms, the purple circle indicates a pig farm, and the blue line indicates the Lerma marshes boundaries.

Figure 2. Timeline of sample collection in wild ducks, backyard poultry, and backyard pigs. From Lerma, State of Mexico. The black numbers represent the total of sampled animals. The circled numbers indicate the ID numbers of the farms.

Figure 3. Influenza A virus frequency in wild dabbling ducks. The relative percentage of wild ducks positive to IAV by specie and sampling month.

Figure 4. Maximum-likelihood phylogenetic tree of the hemagglutinin (HA) gene segment of Influenza A viruses from wild ducks of Lerma, State of Mexico 2016 – 2017. Mexican viruses isolated are shown in colors by subtype: blue (H5N2), purple (H1N1), and red (H3N2). Scale bars indicate nucleotide substitutions per site.