Volume 17, Number 6—June 2011
Dispatch
Reassortant Pandemic (H1N1) 2009 Virus in Pigs, United Kingdom
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.