Introduction. The authors of these bulletins are infectious diseases physicians on the front line in the epidemic of severe acute respiratory syndrome (SARS) in Hong Kong. They are affiliated with the Division of Infectious Disease, Department of Microbiology, at Queen Mary Hospital and the University of Hong Kong, and they are also caring for patients in the Pamela Youde Nethersole Eastern Hospital, Princess Margaret Hospital, and Kwong Wah Hospital. Their bulletins are being published in the News section of the electronic edition of Clinical Infectious Diseases within 1–2 days after receipt in our office; below is the most recent bulletin, from 5 May 2003.—Sherwood Gorbach and Michael Barza