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 Lupiani
Table 4
Multivariate logistic regression model to identify variables associated with a positive real-time RT-PCR result, Texas mid–Gulf Coast, USA, 2006–07, 2007–08, and 2008–09*
| Variable | Odds ratio (95% CI) | p value |
|---|---|---|
| Sex | ||
| Drake | 1.0† | |
| Hen |
1.07 (0.859–1.320) |
0.558 |
| Age | ||
| Adult | 1.0 | |
| Juvenile |
1.45 (1.17–1.81) |
0.001 |
| Species | ||
| Other species | 1.0 | |
| Gadwall | 0.407 (0.120–0.825) | 0.013 |
| Northern shoveler | 1.51 (0.987–2.320) | 0.057 |
| Blue-winged teal | 2.18 (1.52–3.13) | <0.001 |
| Green-winged teal | 1.12 (0.742–1.680) | 0.592 |
*Results for a total of 4,187 samples, collected during September–January for each season. RT-PCR, reverse transcription–PCR; CI, confidence interval. Boldface indicates significant result.
†Reference category.
