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Distribuzione del virus influenzale tra le stagioni considerate nello studio.
| Stagione influenzale | % tipo B | % Yamagata | % Victoria | % tipo A | % H1N1 | % H3N2 | Lineaggio di tipo B incluso nel vaccino |
|---|---|---|---|---|---|---|---|
| 2010-2011 | 28% | 6% | 94% | 72% | 97% | 3% | Victoria |
| 2011-2012 | 4% | 99% | 1% | 97% | 0.2% | 100% | Victoria |
| 2012-2013 | 58% | 98% | 2% | 42% | 86% | 14% | Yamagata |
| 2013-2014 | 3% | 99% | 1% | 97% | 38% | 62% | Yamagata |
| 2014-2015 | 16% | 97% | 3% | 84% | 56% | 44% | Yamagata |
| 2015-2016 | 57% | 5% | 95% | 43% | 38% | 62% | Yamagata |
| 2016-2017 | 5% | 96% | 4% | 95% | 1% | 99% | Victoria |
