Table 2.
Hemagglutination titers against influenza A(H1N1)pdm09 virus in pig sera in Tumbes, Peru, 2009–2011
| HI titera | No. of sera positive (%) by period | |||
|---|---|---|---|---|
| Pre‐pandemic (March 2009) | Peak pandemic (October 2009) | Post‐pandemic 1 (April 2010) | Post‐pandemic 2 (October 2011) | |
| 10 | 0 (0) | 3 (11) | 16 (20) | 1 (25) |
| 20–40 | 0 (0) | 10 (37) | 50 (63) | 3 (75) |
| 80–160 | 0 (0) | 13 (48) | 13 (17) | 0 (0) |
| 640 | 0 (0) | 1 (4) | 0 (0) | 0 (0) |
| Total | 0 (0) | 27 (100) | 79 (100) | 4 (100) |
a
The limit of detection for the hemagglutination assay was set to ≥1:10.