Table 1.
FluWatch surveillance system reports of influenza B strains in Canada during influenza seasons from 1999 to 2012.
| Influenza season starting: |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000† | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010* | 2011* | 2012* | |
| Total cases of influenza B | 43 | 254 | 152 | 128 | 40 | 214 | 472 | 119 | 673 | 570 | 7 | 586 | 965 | 602 |
| B/Victoria (Yamanashi-like) | — | 100% | — | — | — | — | — | — | — | — | — | — | — | — |
| B/Victoria (Beijing-like) | 100% | — | — | — | — | — | — | — | — | — | — | — | — | — |
| B/Yamagata (Sichuan-like) | — | — | 3% | — | 83% | — | — | — | — | — | — | — | — | — |
| B/Victoria (Hong Kong-like) | — | — | 97% | 100% | 18% | 21% | 29% | — | — | — | — | — | — | — |
| B/Yamagata (Shanghai-like) | — | — | — | — | — | 79% | 1% | 90% | — | — | — | — | — | — |
| B/Victoria (Malaysia-like) | — | — | — | — | — | — | 70% | 10% | 3% | 66% | 14% | — | — | — |
| B/Yamagata (Florida-like) | — | — | — | — | — | — | — | — | 97% | 2% | 14% | — | — | — |
| B/Victoria (Brisbane-like) | — | — | — | — | — | — | — | — | — | 32% | 71% | 95% | 48% | 23% |
| B/Yamagata (Wisconsin-like) | — | — | — | — | — | — | — | — | — | — | — | 5% | 53% | 77% |
Note: Data obtained from The Canadian FluWatch surveillance system.11-22
†
There was 1 case of B/Beijing-like influenza in 2000/01 (0.4% of cases). Data not shown due to rounding.
*
Data obtained from FluWatch final cumulative weekly report in absence of a full annual report.20-22