TABLE 3.
Numbers of oseltamivir-sensitive and -resistant strains of influenza A/H1N1 viruses during 2007-2008, 2008-2009, and 2009-2010 seasons in Niigata
| 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 |
a
Samples were collected at a pediatric clinic in Niigata Prefecture in Japan.
b
Oseltamivir-resistant viruses with His275Tyr mutation in NA.