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. 2015 Jun 17;4(6):e35. doi: 10.1038/emi.2015.35

Table 2. Influenza H7-NA subtypes reported in domestic poultry in the Americas between 1976 and 2013.

  N1 N2 N3 N4 N5 N6 N7 N8 N9 Total NO of H7 reports
Commercial farms 4 22 14 0 0 0 2 0 6 48
Live bird markets 0 17 2 0 0 0 0 0 0 19
Total 4 39 16 0 0 0 2 0 6 67