Table 1. Antigenic characterization of A(H1N1)pdm09-like influenza viruses isolated from pigs, Réunion Island, 2010*.
| Virus strain | HI titers† obtained with reference swine hyperimmune serum samples directed against |
||||
|---|---|---|---|---|---|
| California/04/09‡ | Sw/England/ 117316/86§ | Sw/Cotes d'Armor/0388/09¶ | Sw/Flandres/1/98# | Sw/Scotland/ 410440/94** | |
| A/Sw/La Reunion/0164/10 | 1,280 | 160 | 40 | <10 | <10 |
| A/Sw/La Reunion/110348/10 | 1,280 | 80 | 160 | 10 | 20 |
| A/Sw/La Reunion/0167/10 | 640 | 80 | 40 | <10 | <10 |
| A/Sw/La Reunion/110194/10 | 640 | 80 | 20 | <10 | 10 |
*HI, hemagglutination inhibition. †HI tests were performed according to standard procedure (5).Titers are expressed as the reciprocal of the highest dilution of serum that inhibits 4 hemagglutination units of virus. ‡A(H1N1)pdm09 lineage. §Classical swine A(H1N1). ¶Avian-like swine A(H1N1). #Human-like reassortant swine A(H3N2). **Human-like reassortant swine A(H1N2).