Table 3.
Analysis of influenza vaccine strain changes from 2000 to 2011 including the number of strain changes in this period and the requirements for new antiserum for SRID reagents versus EIA reagents. EIA forward reactive refers to EIA mAbs reactive to strains of the same or subsequent years. Years refer to the number of years within the 12‐year period that EIA reagents would have been available
| Subtype | Strain changes | SRID reagents | EIA reagents | EIA forward reactive | Years |
|---|---|---|---|---|---|
| H1N1 | 4 | 4 | 3 | 2 | 12 |
| H3N2 | 10 | 10 | 3 | 6 | 9 |
| B | 8 | 8 | 4 | 3 | 11 |
| H5N1* | 2 | 2 | 1 | 1 | – |
–: Years available not applicable as was not included in seasonal vaccine.
*Not included in seasonal vaccine.