Volume 15, Number 12—December 2009
Risk for Infection with Highly Pathogenic Avian Influenza Virus (H5N1) in Backyard Chickens, Bangladesh
|Risk factor||Odds ratio||95% Confidence interval||p value|
|Nearby (<0.1 km) body of water||3.64||0.82–16.18||0.089|
|Commercial farm within 0.5 km||3.57||0.34– 37.82||0.291|
|Migratory bird seen around farm||3.37||0.05–234.59||0.575|
|Contact with ducks||1.47||0.15–14.29||0.740|
|Contact with pigeons||7.64||1.00–58.48||0.050|
|Presence of rodents||7.94||0.89–72.61||0.067|
|Chickens and ducks in different night shelters||0.08||0.01–0.71||0.023|
|Offering slaughter remnants of purchased chickens†||9.02||0.77–105.79||0.080|
*Conditional logistic regression; initial set with 8 variables entered; χ2 for likelihood ratio test = 43.85; p>0.001; no. observations = 100.
†Within 21 days of the onset clinical signs in case backyard farms.
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