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Table 1 Nucleotide and amino acid variability of the influenza A NS1 gene H1N1v isolates with respect to H1N1 and H3N2 isolates from previous seasonal epidemics in comparison with reference human (A/Brevig Mission/1/1918) and swine influenza A H1N1 (A/Swine/Oklahoma/042169/2008) isolates.

From: Genetic divergence of influenza A NS1 gene in pandemic 2009 H1N1 isolates with respect to H1N1 and H3N2 isolates from previous seasonal epidemics

  Mean % nucleotide identity (range) Mean % amino acid identity (range)
Influenza strains A/Brevig Mission/1/1918 A/Swine/Oklahoma/042169/2008 A/Brevig_Mission/1/1918 A/Swine/Oklahoma/042169/2008
H1N1 90.9 (90.4-91.5) 81.8 (81.1-82.2) 86.8 (85.4-87.4) 79.2 (78.4-79.5)
H3N2 88.0 (87.5-88.4) 80.0 (79.3-80.4) 82.7 (81.8-83.4) 76.2 (74.2-77.1)
H1N1v 83.4 (83.1-83.7) 93.8 (93.6-94.1) 83.2 (82.2-83.9) 92.1 (91.4-92.9)