Centers for Disease Control and Prevention, Emerging Infectious Diseases, 12(17), p. 2379-2380, 2011
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TO THE EDITOR: Since 1997, routine surveillance has demonstrated periodic reemergence of influenza A (H5N1) viruses (avian influenza) in retail markets in Hong Kong, People's Republic of China (1,2), leading to stepped implementation (progressively implementing more measures over time) of measures to reduce human exposure to influenza subtype H5N1. From 2006 through November 2008, progressive importation and farm restrictions and curtailed retail capacity cut Hong's live poultry supply in half, from 40,000 to <20,000 chickens daily (3,4).