Table 1.
Influenza isolates characterized by hemagglutination inhibition assay by WHO Collaborating Centres (samples collected in March – August, 2011)
| A(H1N1)pdm09a | A(H3N2)b | B/Victoriac | B/Yamagatad | |
|---|---|---|---|---|
| Total tested | 1232 | 776 | 1770 | 598 |
| Low reactors (% of total) | 160 (3%) | 40 (5%) | 53 (3%) | 0 |
a
Compared to the A/California/7/2009 vaccine virus
b
Compared to the A/Perth/16/2009 vaccine virus
c
Compared to the B/Brisbane/60/2008 vaccine virus
d
Compared to reference viruses B/Wisconsin/01/2010, B/Hubei-Wujiagang/158/2009 or B/Bangladesh/3333/2007