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Volume 10, Number 12—December 2004

Dispatch

West Nile Virus Viremia in Wild Rock Pigeons

Andrew B. Allison*Comments to Author , Daniel G. Mead*, Samantha E. J. Gibbs*, Douglas M. Hoffman†, and David E. Stallknecht*
Author affiliations: *University of Georgia, Athens, Georgia, USA; †United States Department of Agriculture–Wildlife Services, Athens, Georgia, USA

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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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