Epidemiology
Further information: Transmission and infection of H5N1 and Global spread of H5N1The earliest infections of humans by H5N1 coincided with an epizootic (an epidemic in nonhumans) of H5N1 influenza in Hong Kong's poultry population. This panzootic (a disease affecting animals of many species, especially over a wide area) outbreak was stopped by the killing of the entire domestic poultry population within the territory. However, the disease has continued to spread. On December 21, 2009 the WHO announced a total of 447 cases which resulted in the deaths of 263.
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