Volume 16, Number 8—August 2010
Research
Multiyear Surveillance for Avian Influenza Virus in Waterfowl from Wintering Grounds, Texas Coast, USA
Table 3
Comparison of apparent prevalence of avian influenza virus in hunter-harvested waterfowl, Texas mid–Gulf Coast, USA, September–January 2006–07, 2007–08, and 2008–09*
Hunting season | Juvenile waterfowl† |
Adult waterfowl† |
p value |
|||||||
---|---|---|---|---|---|---|---|---|---|---|
No. tested | rRT-PCR | VI | No. tested | rRT-PCR | VI | rRT-PCR | VI | |||
2006–07 | 518 | 8.30 (5.92–10.68) | 3.28 (1.75–4.82) | 1,081 | 5.46 (4.10–6.81) | 0.74 (0.23–1.25) | 0.029 | <0.001 | ||
2007–08 | 763 | 13.80 (11.30–16.20) | 5.50 (3.89–7.12) | 1,189 | 10.51 (8.77–12.20) | 3.28 (2.27–4.29) | 0.030 | 0.022 | ||
2008–09 |
222 |
8.56
(4.88–12.24) |
1.80
(0.49–4.55) |
489 |
4.70
(2.82–6.58) |
0.20
(0.01–1.13) |
0.043 |
0.035 |
||
Total‡ | 1,503 | 11.10 (9.52–12.69) | 4.06 (3.06–5.06) | 2,759 | 1.74 (1.25–2.23) | 1.74 (1.25–2.23) | <0.001 | <0.001 |
*rRT-PCR, real-time reverse transcription–PCR; VI, virus isolation.
†Values for rRT-PCR and VI are apparent prevalence, % (95% confidence interval).
‡Total = the 3 hunting seasons combined (September–January, 2006–07, 2007–08, and 2008–09).