U.S. health authorities say the flu arrived about a month earlier than usual this year, and the flu strain making most people sick - H3N2 - has a reputation for causing fairly severe illness, especially in the elderly（尤其是老年人）. 

由于病例过多，医院床位都出现短缺。部分城市例如波士顿已经宣布健康紧急状态（将从星期六起提供免费Flu vaccine）。

所以提请各位尽快去打预防针。