Avian Influenza Disease Emergency: issue No. 62 (09/12/2009)
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In late 2003 highly pathogenic avian influenza (A) subtype H5N1 (H5N1 HPAI) emerged in Southeast Asia causing poultry and economic losses on a large scale. Since 2004, the disease has spread to the rest of Asia, Europe and Africa. Despite the ongoing interventions on many fronts, including public education, surveillance sampling, restrictions on livestock movement, improvements in farm biosecurity, live-bird market disinfection, culling rounds, and vaccination campaigns, H5N1 HPAI continues to p ersist in China, Indonesia, Viet Nam, Bangladesh, and Egypt. Veterinary epidemiologists involved in influenza research recognize that this persistence suggests there are more complex epidemiological risk factors for the transmission and maintenance of this virus than originally identified...