Table 2. Influenza B vaccine components and distribution of influenza B lineages in northern Viet Nam, 2007–2014.
| Northern hemisphere |
Southern hemisphere |
Number of isolates in Viet Nam included in the study |
||||
|---|---|---|---|---|---|---|
| Influenza seasons | Vaccine candidate strains | Influenza seasons | Vaccine candidate strains | Years | Victoria lineage (n = 195) | Yamagata lineage (n = 136) |
| 2007–2008 | B/Malaysia/2506/2004-like virus | 2007 | B/Malaysia/2506/2004-like virus | 2007 | 2 | 24 |
| 2008–2009 | B/Florida/04/2006-like virus | 2008 | B/Florida/04/2006-like virus | 2008 | 2 | 29 |
| 2009–2010 | B/ Brisban/60/2008 -like virus | 2009 | B/ Brisban/60/2008 -like virus | 2009 | 21 | 3 |
| 2010–2011 | B/Brisbane/60/2008-like virus | 2010 | B/Brisbane/60/2008-like virus | 2010 | 12 | 1 |
| 2011–2012 | B/Brisbane/60/2008-like virus | 2011 | B/Brisbane/60/2008-like virus | 2011 | 37 | 4 |
| 2012–2013 | B/Brisbane/60/2008-like virus. | 2012 | B/Brisbane/60/2008-like virus. | 2012 | 21 | 31 |
| 2013–2014 | B/Wisconsin/1/2010-like virus. | 2013 | B/Wisconsin/1/2010-like virus. | 2013 | 50 | 32 |
| 2014–2015 | B/Massachusetts/2/2012-like virus | 2014 | B/Massachusetts/2/2012-like virus | 2014 | 50 | 12 |
Note: B/Malaysia/2506/2004-like virus and B/Brisbane/60/2008-like virus belong to the B/Victoria /7/87 lineage. B/Florida/04/2006-like virus, B/Wisconsin/1/2010-like virus and B/Massachusetts/2/2012-like virus belong to the B/Yamagata/16/88 lineage.