1999:H9N2传染人类 本文已影响 3.11K人 ing-bottom: 73.6%;">1999:H9N2传染人类1999: H9N2 Infects Humans第一次出现在人体内。禽类可能是病毒来源。Appeared for the first time in humans. It caused illness in two children in Hong Kong, with poultry being the probable source.