Table 2.
Proportion of susceptible individuals estimated at the start and at the end of the season using serological data in the last nine epidemic seasons, including the correction to account for vaccination in elderly
| Season | Predominant (sub)type and strain | Susceptible adults (%) | Susceptible elderly (%) | ||
|---|---|---|---|---|---|
| Start | End | Start | End | ||
| 2000–2001 | A/H1N1/NewCaledonia/20/99 | 80 | 64 | 41 | 27 |
| 2001–2002 | B/Hong Kong/330/01 | N.A. | 59 | N.A. | 29 |
| 2002–2003 | A/H3N2/Moscow/10/99 | 64 | 19 | 39 | 3 |
| 2003–2004 | A/H3N2/Fujian/411/02 | N.A. | 27 | N.A. | 11 |
| 2004–2005 | Multiple strains | N.A. | N.A. | N.A. | N.A. |
| 2005–2006 | Multiple strains | N.A. | N.A. | N.A. | N.A. |
| 2006–2007 | Multiple strains | N.A. | N.A. | N.A. | N.A. |
| 2007–2008 | A: Multiple strains B: B/Florida/4/06 | N.A. N.A. | N.A. 68 | N.A. N.A. | N.A. 21 |
| 2008–2009 | A/H3N2/Brisbane/10/07 | 83 | N.A. | 42 | N.A. |
N.A., not available (tested and circulated strains did not coincide).