This report updates reported cases of severe acute respiratory syndrome
(SARS) worldwide and in the United States, describes a change in the recommended
timing of collection of a convalescent-phase serum specimen to test for antibody
to SARS-associated coronavirus (SARS-CoV), and introduces a new case exclusion
criterion based on negative SARS-CoV serology.1 In addition, this
report also summarizes changes in travel alerts for Beijing and mainland China,
Hong Kong, Toronto, and Taiwan.