Effect of Interventions on Influenza A (H9N2) Isolation in Hong Kong’s Live Poultry Markets, 1999–2005

摘要

Live poultry markets (LPMs) are a recognized source of in. uenza viruses. Since 2001 and 2003, respectively, a fi rst and second monthly "rest-day" has been implemented in Hong Kong's LPMs, when stalls are cleared of unsold poultry and disinfected. We assessed the incremental ef-fectiveness of each rest-day and the banning of live quail sales in 2002 in reducing (H9N2) subtype isolation rates for chickens and minor poultry, by using a multivariable Pois-son generalized linear model. There was a 58% reduction (p = 0.001) in virus isolation after 1 monthly rest-day in mi-nor poultry compared with 27% (p = 0.22) in chickens. Com-bining 1 rest-day with the removal of quails further reduced virus isolation in chickens but not in minor poultry. However, an additional rest-day each month did not appear to affect isolation rates for either species