1. Beijing Center for Disease Prevention and Control, Beijing, China
2. World Health Organization–China Office, Beijing, ChinaCenters for Disease Control and Prevention, Atlanta, Georgia, USAThese authors served as temporary advisors to the World Health Organization–China Office SARS team
3. Beijing Municipal Health Bureau, Beijing, China
4. Beijing Municipal Health Bureau, Beijing, ChinaBeijing Joint SARS Expert Group, Beijing, China
5. World Health Organization–China Office, Beijing, China