The H5N1 strain was first discovered in Hong Kong in 1997 and has spread to the rest of Asia, Europe and Africa through birds.
Lenkinga ye H5N1 yabanjwa kucala eHong Kong ngemnyaka wa 1997, ngekuya kweNhlangano Yemhlaba Yetemphilo Wetilwane, yatseleleka kusuka eAsia kuya e Europe nase Afrika kusuka ngemnyaka wa 2003.