title: Risk for infection with highly pathogenic avian influenza virus (H5N1) in backyard chickens, Bangladesh.
abstract: To evaluate risk factors for infection with highly pathogenic avian influenza A virus (H5N1) in backyard chickens in Bangladesh, we conducted a matched case-control study. We enrolled 25 case farms (cases March-November 2007) and 75 control farms (June-November 2007). We used a questionnaire to collect farm data, which were analyzed by matched-pair analysis and multivariate conditional logistic regression. Factors independently associated were offering slaughter remnants of purchased chickens to backyard chickens (odds ratio [OR] 13.29, 95% confidence interval [CI] 1.34-131.98, p = 0.027), having a nearby water body (OR 5.27, 95% CI 1.24-22.34, p = 0.024), and having contact with pigeons (OR 4.47, 95% CI 1.14-17.50, p = 0.032). Separating chickens and ducks at night was protective (OR 0.06, 95% CI 0.01-0.45, p = 0.006). Reducing these risks and taking protective measures might reduce the risk for influenza (H5N1) infection in backyard chickens.
authors: Department of Microbiology, Chittagong Veterinary and Animal Sciences University, Khulshi, Chittagong, Bangladesh. biswaspk2000@yahoo.com
authors: Paritosh K
authors: PK
authors: Biswas
authors: Jens P
authors: JP
authors: Christensen
authors: Syed S U
authors: SS
authors: Ahmed
authors: Ashutosh
authors: A
authors: Das
authors: Mohammad H
authors: MH
authors: Rahman
authors: Himel
authors: H
authors: Barua
authors: Mohammad
authors: M
authors: Giasuddin
authors: Abu S M A
authors: AS
authors: Hannan
authors: Mohammad A
authors: MA
authors: Habib
authors: Nitish C
authors: NC
authors: Debnath
mesh_terms: D000818:Animals; D001459:Bangladesh; D016022:Case-Control Studies; D002645:Chickens / Q000821:virology*; D010856:Columbidae / Q000821:virology; D004372:Ducks / Q000821:virology; D053124:Influenza A Virus, H5N1 Subtype / Q000472:pathogenicity*; D016015:Logistic Models; D015999:Multivariate Analysis; D009976:Orthomyxoviridae Infections / Q000209:etiology / Q000662:veterinary*; D011201:Poultry Diseases / Q000209:etiology*; D012307:Risk Factors