Avian Influenza and Ban on Overnight Poultry Storage in Live Poultry Markets, Hong Kong
Figure. . . Weekly influenza virus A (H9N2) isolation rates for chickens (A) and minor poultry (B) in live poultry markets, Hong Kong, September 1999–May 2011. Vertical lines denote periods for different interventions: I, no rest day; II, 1 monthly rest day with quail sold in live poultry markets; III, 1 monthly rest day with no sales of quail in live poultry markets; IV,: 2 monthly rest days; V, ban on keeping live poultry overnight in live poultry markets.