did you know about the spanish flu before the SARS and avian flu outbreaks?
here's some link in chinese:
http://health.people.com.cn/GB/26466/77129/
http://www.people.com.cn/GB/32306/32313/32330/3900380.html
here's some link in chinese:
http://health.people.com.cn/GB/26466/77129/
http://www.people.com.cn/GB/32306/32313/32330/3900380.html