Volume 15, Number 12—December 2009
Research
Risk for Infection with Highly Pathogenic Avian Influenza Virus (H5N1) in Backyard Chickens, Bangladesh
Paritosh K. Biswas
, 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
, 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. DebnathTable 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.
