Volume 10, Number 12—December 2004
Dispatch
West Nile Virus Viremia in Wild Rock Pigeons
Andrew B. Allison*
, Daniel G. Mead*, Samantha E. J. Gibbs*, Douglas M. Hoffman†, and David E. Stallknecht*
, Daniel G. Mead*, Samantha E. J. Gibbs*, Douglas M. Hoffman†, and David E. Stallknecht*
Table 1
Flavivirus seroprevalence rates in free-ranging rock pigeons from northwest rail yard, Fulton County, Georgia, 2002–2003a
| Collection date | No. tested | n (%) WNV+ [95% CI] | n (%) SLEV+ [95% CI] | n (%) FLAVI+ [95% CI] | n (%) viremic [95% CI] |
|---|---|---|---|---|---|
| 2002 | |||||
| Feb 28 | 56 | 25 (44.6) [32.4–57.6] | 0 | 2 (3.6) [1.0–12.1] | NT |
| Mar 6–7 | 107 | 35 (32.7) [24.6–42.1] | 0 | 1 (0.9) [0.2–5.1] | NT |
| Aug 15 | 58 | 9 (15.5) [8.4–26.9] | 0 | 0 | 0 |
| Aug 22 | 68 | 13 (19.1) [11.5–30.0] | 0 | 0 | 7 (10.3) [5.1–19.8] |
| Total | 289 | 82 (28.4) [23.5–33.8] | 0 | 3 (1.0) [0.4–3.0] | 7/126 (5.6) [2.7–11.0] |
| 2003 | |||||
| Apr 16 | 34 | 17 (50) [34.1–65.9] | 0 | 0 | NT |
| Apr 29 | 33 | 9 (27.3) [15.1–44.2] | 0 | 0 | NT |
| Jul 30 | 71 | 8 (11.3) [5.8–20.7] | 0 | 0 | 2 (2.8) [0.8–9.7] |
| Sep 5 | 72 | 12 (16.7) [9.8–26.9] | 1 (1.4) [0.3–7.4] | 1 (1.4) [0.3–7.4] | 2 (2.8) [0.8–9.6] |
| Total | 210 | 46 (21.9) [16.8–28.0] | 1 (0.5) [0.1–2.7] | 1 (0.5) [0.1–2.7] | 4/143 (2.8) [1.1–7.0] |
aWNV, West Nile virus; SLEV, St. Louis encephalitis virus; FLAVI, flavivirus; WNV+, samples in which a fourfold difference in WNV antibody titer over SLEV could be demonstrated; SLEV+, samples in which a fourfold difference in SLEV antibody titer over WNV could be demonstrated; FLAVI+, samples in which a fourfold difference in titer between WNV and SLEV could not be demonstrated and therefore classified as flavivirus positive; CI, confidence interval; NT, not tested for viremia.
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