Fig. (1) Phylogenetic trees corresponding to complete coding nucleotide sequences for the (A) HA and (B) NA genes, respectively, each comparing all known subtypes, four worldwide H1N1pdm09 strains (randomly selected), 13 Paraguayan isolates, and the vaccine strain A/California/07/2009. Each sequence is indicated with its GenBank accession number, host of origin (omitted for human strains), geographical origin, name of isolate, and year of isolation. Bootstrap values greater than 70%are shown at branch nodes. Paraguayan isolates are shown with a filled circle. Branch distances are indicated by a scale bar (0.02 nt substitution per site) at the bottom of each tree.