Volume 17, Number 6—June 2011
Dispatch
Reassortant Pandemic (H1N1) 2009 Virus in Pigs, United Kingdom
Wendy A. Howard, Steve C. Essen, Benjamin W. Strugnell, Christine Russell, Laura Barrass, Scott M. Reid, and Ian H. Brown
Table 2
Serologic cross-reactivity titers of acute-phase and convalescent-phase swine serum samples against subtypes of swine influenza viruses, United Kingdom*
| Phase and pig no. | Virus |
|||
|---|---|---|---|---|
| A/Swine/England/438207/94, subtype H1N2 | A/Swine/England/195852/92, subtype H1N1 | A/swine/England/1353/09, pandemic (H1N1) 2009 | A/swine/England/1382/10, reassortant subtype H1N2 | |
| Acute phase | ||||
| 1 | <10 | 40 | 320 | <10 |
| 2 | <10 | <10 | 160 | <10 |
| 3 | <10 | <10 | 160 | <10 |
| 4 | <10 | <10 | 320 | <10 |
| 5 | <10 | <10 | 160 | <10 |
| 6 | <10 | <10 | 320 | <10 |
| 7 | <10 | <10 | 640 | <10 |
| 8 | <10 | <10 | 320 | <10 |
| 9 | <10 | <10 | <10 | <10 |
| 10 |
<10 |
<10 |
80 |
<10 |
| Convalescent phase | ||||
| 1 | 80 | 20 | 2,560 | 160 |
| 2 | <10 | <10 | 5,120 | 160 |
| 3 | <10 | <10 | 2,560 | 80 |
| 4 | 160 | 160 | 1,280 | 160 |
| 5 | <10 | <10 | 1,280 | 80 |
| 6 | 640 | 160 | 5,120 | 160 |
| 7 | <10 | <10 | 2,560 | 320 |
| 8 | 160 | 40 | 5,120 | 320 |
| 9 | 320 | 320 | 2,560 | 160 |
*Acute-phase serum samples were obtained from 10 pigs in the same batch during the time when clinical signs were apparent (≈2 wk after arrival at the unit). Convalescent-phase serum samples were obtained from 9 pigs in the same batch 21 d later. Standard hemagglutinin inhibition assays were conducted with subtype H1N1, pandemic (H1N1) 2009, and subtype H1N2 virus antigens derived from UK swine isolates. Homologous A/swine/England/1382/10 antigen was also used.
