TABLE 3.
Season | Virus subtype | No. of influenza A (H1N1) virus-positive samplesa | No. of oseltamivir-resistant virusesb | Proportion of oseltamivir-resistant viruses (%) |
---|---|---|---|---|
2007-2008 | Seasonal influenza A (H1N1) | 72 | 0 | 0.0 |
2008-2009 | Seasonal influenza A (H1N1) | 282 | 282 | 100.0 |
2009-2010 | Seasonal influenza A (H1N1) | 0 | 0 | |
Influenza A pandemic (H1N1) 2009 | 73 | 0 | 0.0 |
Samples were collected at a pediatric clinic in Niigata Prefecture in Japan.
Oseltamivir-resistant viruses with His275Tyr mutation in NA.