Volume 16, Number 8—August 2010
Research
Multiyear Surveillance for Avian Influenza Virus in Waterfowl from Wintering Grounds, Texas Coast, USA
Table A8
Apparent prevalence of avian influenza virus in gadwall and northern shoveler from hunter-harvested waterfowl, Texas mid–Gulf Coast, USA, September–January 2006–07, 2007–08, and 2008–09
Age/sex |
Gadwall |
Northern shoveler |
|||||
No. tested |
Real-time RT-PCR* |
VI† |
No. tested |
Real-time RT-PCR* |
VI† |
||
Adult | 233 | 2.15 (0.29–4.01) | 0.43 (0.01–2.37) | 363 | 7.16 (4.51–9.82) | 1.38 (0.18–2.58) | |
Juvenile | 144 | 3.47 (0.48–6.46) | 0 | 258 | 12.40 (8.38–16.43) | 3.88 (1.52–6.23) | |
p value |
0.436 |
0.431 |
0.027 |
0.046 |
|||
Hen | 221 | 1.36 (0.28–3.92) | 0.45 (0.01–2.50) | 373 | 10.99 (7.82–14.17) | 2.68 (1.04–4.32) | |
Drake | 216 | 3.24 (0.88–5.60) | 0 | 330 | 7.58 (4.72–10.43) | 1.52 (0.20–2.83) |
*RT-PCR, reverse transcription–PCR. Apparent prevalence, % (95% confidence interval).
†VI, virus isolation. Apparent prevalence, % (95% confidence interval). Boldface indicates significance.