Update: severe acute respiratory syndrome--United States, 2003.

CDC, in collaboration with state and local health departments, the World Health Organization (WHO), and other partners, continues to investigate cases of severe acute respiratory syndrome (SARS). During November 1, 2002-May 7, 2003, a total of 6,903 SARS cases were reported to WHO from 29 countries, including the United States; 495 deaths (case-fatality proportion: 7.2%) have been reported. This report updates information on reported U.S. SARS cases.