The H1N1 influenza virus, which caused the 2009 pandemic, continues to circulate in some parts of the world, causing variable levels of disease and outbreaks.
H1N 1流感病毒引起了2009年流感大流行，该病毒会继续在世界上的一些地区传播，造成不同程度的发病和疫情。
Avian influenza (AI) is an infectious viral disease of birds (especially wild water fowl such as ducks and geese), often causing no apparent signs of illness.
禽流感是鸟类病毒性传染病(特别是鸭子和鹅等野生水禽)，通常导致无明显体征的疾病。
Seasonal influenza kills up to 500, 000 people in an average year but Shindo said that in Mexico, at least, the H1N1 flu was causing more severe disease.
Shindo说道，季节性流感平均每年要造成50万以上的人死亡，但是在墨西哥，H1N1流感正在造成更严重的疾病。
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