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Volume 15, Number 12—December 2009


Risk for Infection with Highly Pathogenic Avian Influenza Virus (H5N1) in Backyard Chickens, Bangladesh

Paritosh K. BiswasComments to Author , Jens P. Christensen, Syed S.U. Ahmed, Ashutosh Das, Mohammad H. Rahman, Himel Barua, Mohammad Giasuddin, Abu S.M.A. Hannan, Mohammad A. Habib, and Nitish C. Debnath
Author affiliations: Chittagong Veterinary and Animal Sciences University, Chittagong, Bangladesh (P.K. Biswas, S.S.U. Ahmed, A. Das, M.H. Rahman, H. Barua, N.C. Debnath); Copenhagen University, Copenhagen, Denmark (J.P. Christensen); Bangladesh Livestock Research Institute, Dhaka, Bangladesh (M. Giasuddin); Department of Livestock Services, Dhaka (A.S.M.A. Hannan, M.A. Habib)

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Table 2

Initial results from multivariate analysis of potential risk factors for highly pathogenic avian influenza virus (H5N1) in backyard chickens, Bangladesh, 2007*

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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