Abstract
To determine the epidemiology of outbreaks of avian influenza A virus (subtypes H5N1, H9N2) in chickens in Bangladesh, we conducted surveys and examined virus isolates. The outbreak began in backyard chickens. Probable sources of infection included egg trays and vehicles from local live bird markets and larger live bird markets.
Highlights
Summary statistics were computed and plotted by using Excel (Microsoft, Redmond, WA, USA), Arc View 9.1 (Environmental Systems Research Institute, Redlands, CA, USA), and STATA 7 (Stata Corp., College Station, TX, USA)
The first avian influenza–affected backyard farm was reported on March 22, 2007, the date when avian influenza was confirmed in Bangladesh
Our investigation showed that the epicenter of the HPAI outbreaks in Bangladesh was the Sarishabari upazila of Jamalpur district and that the primary source of infection was backyard chickens
Summary
Summary statistics were computed and plotted by using Excel (Microsoft, Redmond, WA, USA), Arc View 9.1 (Environmental Systems Research Institute, Redlands, CA, USA), and STATA 7 (Stata Corp., College Station, TX, USA). *Infected, avian influenza–infected farms; total, farms in the infected upazila(s) of a district. The index farm was recorded on January 15, 2007, at a local live bird market in Sarishabari upazila in Jamalpur district. We hypothesized that the infection probably came from chickens in nearby backyard farms because high numbers of deaths in this population went uninvestigated.
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