Volume 18, Number 7—July 2012
Dispatch
Human Infection from Avian-like Influenza A (H1N1) Viruses in Pigs, China
Table
Antigenic analysis of H1 swine influenza viruses, People’s Republic of China*
| Virus | HI antibody titers of chicken antiserum against† |
|||||
|---|---|---|---|---|---|---|
| Classical swine A (H1N1) | Triple-reassortant A (H1N2) | A (H1N1) pdm09 | Human seasonal A (H1N1) | Avian-like swine A (H1N1)§ | Avian-like swine A (H1N1)¶ | |
| Classical swine A (H1N1) | 512 | 512 | 512 | ‡ | 8 | ‡ |
| Triple-reassortant A (H1N2) | 1024 | 512 | 1,024 | ‡ | 8 | ‡ |
| A(H1N1)pdm09 | 512 | 512 | 1,024 | ‡ | 16 | ‡ |
| Human seasonal A (H1N1) | 16 | 32 | 64 | 32 | 32 | 64 |
| Avian-like swine A (H1N1)§ | 128 | 64 | 128 | ‡ | 512 | 256 |
| Avian-like swine A (H1N1)¶ | 32 | 16 | 64 | ‡ | 256 | 256 |
*Classical swine A (H1N1), A/swine/Guangdong/6/2010; triple-reassortant A (H1N2), A/swine/Tianjin/1/2007; A(H1N1)pdm09, A/swine/Heilongjiang/44/2009; human seasonal A (H1N1), A/swine/Hebei/15/2009.
†Antiserum was generated by inoculating specific pathogen-free chickens with an oil-emulsified inactivated vaccine derived from the indicated viruses. Homologous titers are shown in boldface.
‡HI titer <2.
§A/swine/Henan/11/2005.
¶A/swine/Jiangsu/40/2011.
1These authors contributed equally to this article.
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