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Volume 16, Number 8—August 2010

Research

Multiyear Surveillance for Avian Influenza Virus in Waterfowl from Wintering Grounds, Texas Coast, USA

Pamela J. Ferro, Christine M. Budke, Markus J. Peterson, Dayna Cox, Emily Roltsch, Todd Merendino1, Matt Nelson, and Blanca LupianiComments to Author 
Author affiliations: Texas A&M University, College Station, Texas, USA (P.J. Ferro, C.M. Budke, M.J. Peterson, D. Cox, E. Roltsch, B. Lupiani); Texas Parks and Wildlife Department, Bay City, Texas, USA (T. Merendino, M. Nelson); 1Current affiliation: Ducks Unlimited, Texas Gulf Coast, Richmond, Texas, USA.

Main Article

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).

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1Current affiliation: Ducks Unlimited, Texas Gulf Coast, Richmond, Texas, USA.

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