Table 3 Antigenic analysis of the A(H1N1) isolates in Yamagata by the HI test
| HI titer of post-infection ferret sera to: | ||
|---|---|---|
| Viruses | A/Solomon Islands/3/2006 | A/Brisbane/59/2007 |
| A(H1N1) vaccine strains | ||
| A/Solomon Islands/3/2006 | 160 | 160 |
| A/Brisbane/59/2007 | 160 | 160 |
| 2007-2008 isolates | ||
| A/Yamagata/1/2008 | 80 | 160 |
| A/Yamagata/66/2008 | 160 | 160 |
| A/Yamagata/67/2008 | 160 | 320 |
| A/Yamagata/68/2008 | 160 | 160 |
| A/Yamagata/69/2008 | 160 | 160 |
| 2008-2009 isolates | ||
| A/Yamagata/125/2008 | 20 | 10 |
| A/Yamagata/126/2008 | 40 | 40 |
| A/Yamagata/128/2008 | 40 | 40 |
| A/Yamagata/45/2009 | 20 | 160 |
| A/Yamagata/80/2009 | 20 | 40 |