Table 1. Contribution of Neisseria meningitidis serogroup W (MenW) in culture-positive invasive meningococcal disease cases, Canada 2009–2016.
| Year | Number of MenW case isolates | Total number of IMD case isolates | MenW case isolates as a percentage of IMD case isolates |
|---|---|---|---|
| 2009 | 12 | 168 | 7.1% |
| 2010 | 6 | 118 | 5.1% |
| 2011 | 10 | 133 | 7.5% |
| 2012 | 3 | 112 | 2.7% |
| 2013 | 5 | 103 | 4.9% |
| 2014 | 6 | 86 | 7.0% |
| 2015 | 6 | 88 | 6.8% |
| 2016 | 15 | 80 | 18.8% |
| All years | 63 | 888 | 7.1% |
Abbreviations: IMD, invasive meningococcal disease; MenW, Neisseria meningitidis serogroup W