Table 2. Seroprevalence rates for influenza A viruses among fattening pigs as determined by ELISA and HI testing, Reunion Island, 2010 and 2011*.
| Time of sampling campaign (total no. farms; total no. pigs) | Antinucleoprotein ELISA |
A(H1N1)pdm09 HI test |
|||
|---|---|---|---|---|---|
| Herd, % | Pigs, % | Herd†, % | Pigs, % | ||
| June 2010 (N = 45; n = 252) | 13.33 | 5.55 | 8.89 | 3.57 | |
| March 2011 (N = 33; n = 256) | 48.48 | 28.12 | 42.42 | 16.41 | |
| July–August 2011 (N = 38; n = 316) | 47.37 | 34.49 | 39.47 | 27.21 | |
| October 2011 (N = 33; n = 259) | 57.57 | 40.93 | 42.42 | 22.01 | |
*Pigs were randomly sampled at the slaughterhouse during 4 campaigns. Seroprevalence rates are % farms positive at the herd level among all farms (N) and % pigs positive at the animal level among all animals (n). HI, hemagglutination inhibition. †Within-herd prevalence of infected pigs ranged from 3% to 23%.