Volume 19, Number 6—June 2013
Active Surveillance for Influenza A Virus among Swine, Midwestern United States, 2009–2011
||Odds ratio (95% CI)
|Spring||0.741||2.0 (1.1– 3.8)||0.01|
*Repeated measures logistic regression multivariable analysis. Generalized χ2 divided by degrees of freedom = 0.92. NA, not applicable.
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