Table 2. The cross-reactivity of H2 influenza viruses with chicken antisera to representative strains of each lineage in HI test.
| Lineages | Clusters | Viruses | HI titers of the antisera |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Dk/HK/78 | Sing/57 | Pin/SMN/81 | Dk/Hok/13 | Mal/ALB/84 | Dk/AK/94 | Swine/MO/06 | |||
| Eurasian | 1 | Dk/HK/78 (H2N9) | 320 | 2,560 | 640 | 320 | 640 | 2,560 | 640 |
| 2 (Human) | Sing/57 (H2N2) | 640 | 5,120 | 1,280 | 640 | 2,560 | 2,560 | 640 | |
| 3 | Pin/SMN/81 (H2N3) | 40 | 2,560 | 320 | 160 | 320 | 1,280 | 320 | |
| 4 | Dk/Hok/13 (H2N1) | 320 | 2,560 | 640 | 640 | 1,280 | 1,280 | 640 | |
| North American | Mal/ALB/84 (H2N5) | 320 | 1,280 | 640 | 320 | 1,280 | 2,560 | 1,280 | |
| Dk/AK/94 (H2N3) | 320 | 2,560 | 320 | 320 | 640 | 2,560 | 1,280 | ||
| (Swine) | Swine/MO/06 (H2N3) | 640 | 2,560 | 1,280 | 640 | 5,120 | 2,560 | 2,560 | |
Homologous titers are underlined. Abbreviations: Dk/HK/78, A/duck/Hong Kong/278/1978 (H2N9); Sing/57, A/Singapore/1/1957 (H2N2); Pin/SMN/81, A/pintail/Shimane/1086/1981 (H2N3); Dk/Hok/13, A/duck/Hokkaido/162/2013 (H2N1); Mal/ALB/84, A/mallard/Alberta/884/1984 (H2N5); Dk/AK/94, A/duck/Alaska/5111/1994 (H2N3); Swine/MO/06, A/swine/Missouri/2124514/2006 (H2N3).