Table 3.
PRNT titers for anti-WNV antibody in sera collected from American White Pelican chicks sampled 3 weeks before the onset of WNV mortality, near fledging, and after the peak of WNV mortality at Chase Lake, North Dakota (2006–2008), Bitter Lake, South Dakota (2006–2008), and Medicine Lake, Montana (2006)
| Titer | Year | |||||
|---|---|---|---|---|---|---|
| 2006 | 2007 | 2008 | ||||
| No. < 3-week-old chicks | No. near-fledged chicks | No. < 3-week-old chicks | No. near-fledged chicks | No. < 3-week-old chicks | No. near-fledged chicks | |
| 1:20 | 1 | 6 | 1 | 2 | 7 | 0 |
| 1:40 | 2 | 23 | 1 | 4 | 3 | 3 |
| 1:80 | 1 | 10 | 0 | 12 | 0 | 4 |
| 1:160 | 0 | 3 | 0 | 8 | 0 | 8 |
| 1:320 | 1 | 4 | 0 | 6 | 0 | 5 |
| 1:640 | 0 | 0 | 0 | 5 | 0 | 2 |
| 1:1280 | 0 | 0 | 0 | 1 | 0 | 0 |
| Total PRNT90-positive* | 5 | 46 | 2 | 38 | 10 | 22 |
| Geometric mean | 5.92 | 5.8 | 4.82 | 7.14 | 4.62 | 7.27 |
| Geometric mean titer | 1:61 | 1:56 | 1:28 | 1:141 | 1:25 | 1:154 |
*
Samples were considered positive for antibodies to flavivirus if ≥ 90% of the plaques in the test dose of WNV were neutralized (PRNT90).