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. 2018 Apr 5;13(4):e0195327. doi: 10.1371/journal.pone.0195327

Fig 2. Hemagglutinin and Neuraminidase subtypes identified by year.

Fig 2

Totals and proportions of influenza A virus subtypes (Hemagglutinin [HA, A]; Neuraminidase [NA, B]) identified per year from virus isolation positive samples collected at Izembek National Wildlife Refuge, Alaska, USA. The number of sequences identified for each of the surface glycoproteins are 38, 26, 28, 44, and 43 for the years 2011–2015, respectively. The total numbers of HA and NA sequences (179 each) exceed the total number of isolates genomically sequenced (172) because two HA and two NA sequences were identified from seven mixed infection samples.