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Figure 2

From: Surveillance of avian influenza viruses from 2009 to 2013 in South Korea

Figure 2

Overall frequency of hemagglutinin (HA) and neuraminidase (NA) subtypes of avian influenza viruses (AIVs) isolated from the fecal matter of wild migratory birds in Korea (2009–2013). The frequencies of (a) HA subtypes, (b) NA subtypes, and (c) HA and NA combinations of AIV isolates were calculated relative to the total number of isolates (n = 126). NX: unknown NA subtypes.

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