Between 2004 and 2006, four major epidemic waves of HPAI H5N1 in poultry were recognized followed by some sporadic cases in 2007 and 2008 [14]. As a notorious zoonosis, there were 25 laboratory-confirmed HPAI H5N1 human cases with 17 deaths throughout the course of epidemics. Unsurprisingly, most of the cases were previously contact with infected poultry especially backyard chickens [15].