Table 1. Number of influenza B lineage isolates included for phylogenetic analysis, northern Viet Nam, 2007–2014 (n = 64).
Year | Number of influenza B isolates selected for haemagglutinin gene analysis | ||
---|---|---|---|
Victoria lineage | Yamagata lineage | Total | |
2010 | 3 | 2 | 5 |
2011 | 14 | 8 | 22 |
2012 | 7 | 7 | 14 |
2013 | 4 | 4 | 8 |
2014 | 11 | 4 | 15 |
Total | 39 | 25 | 64 |