Volume 13, Number 9—September 2007
Research
Effect of Interventions on Influenza A (H9N2) Isolation in Hong Kong’s Live Poultry Markets, 1999–2005
Figure 3

Figure 3. Weekly influenza A (H9N2) isolation rates for chickens (A) and minor poultry (B) in Hong Kong, September 1999–December 2005. Dotted lines denote the different periods: I, no rest-day; II, 1 rest-day with quails sold in live poultry markets; III, 1 rest-day with quails removed from live poultry markets; IV, 2 rest-days.