Table A7. Comparison of apparent prevalence of avian influenza virus in blue-winged and green-winged teal from hunter-harvested waterfowl, Texas mid–Gulf Coast, USA, September–January 2006–07, 2007–08, and 2008–09.

Age/sex	Blue-winged teal				Green-winged teal
	No. tested	Real-time RT-PCR*	VI†		No. tested	Real-time RT-PCR*	VI†
Adult	910	11.00 (8.97–13.04)	3.85 (2.60–5.10)		790	6.33 (4.63–8.03)	0.38 (0.08–1.11)
Juvenile	620	15.48 (12.64–18.33)	6.94 (4.94–8.94)		251	7.57 (4.30–10.84)	1.99 (0.26–3.72)
p value		0.010	0.007			0.491	0.011
Hen	772	13.73 (11.30–16.16)	4.40 (2.96–5.85)		548	6.57 (4.50–8.64)	0.91 (0.12–1.71)
Drake	894	11.30 (9.22–13.37)	4.92 (3.50–6.34)		581	7.75 (5.57–9.92)	0.86 (0.11–1.61)
p value		0.133	0.618			0.444	0.926

*RT-PCR, reverse transcription–PCR. Apparent prevalence, % (95% confidence interval).
†VI, virus isolation. Apparent prevalence, % (95% confidence interval). Boldface indicates significance.