Table 4. Cross-neutralization immune response of American Crows 24 days postinfection (dpi) with either KEN or KUN virusesa.
| Sample no. | Inoculation | NY99 | KEN | KUN | Difference |
|---|---|---|---|---|---|
| Crow 8 | KEN | 640b | 640 c | NT | 0 |
| Crow 1 | KUN | 160 | NTd | 320 | 2-fold |
| Crow 2 | KUN | 320 | NT | 320 | 0 |
| Crow 3 | KUN | 160 | NT | 160 | 0 |
| Crow-4 | KUN | 160 | NT | 320 | 2-fold |
| Crow 5 | KUN | 160 | NT | 160 | 0 |
| Crow 6 | KUN | 320 | NT | 320 | 0 |
| Crow-7 | KUN | 640 | NT | 640 | 0 |
| Crow 8 | KUN | 640 | NT | 640 | 0 |
aFollowing secondary NY99 challenge at 14 dpi. bValues represent the greatest reciprocal dilution in which >90% plaque inhibition was achieved as compared to sera-negative control cultures. cHomologous titers are depicted in bold print. dNT not tested; KEN, West Nile virus strain from Kenya; KUN (Kunjin), West Nile virus strain from Australia.