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identification of the SARS-associated coronavirus (SARS-CoV)1,2 has led to the development of serologic and viro-logic tests for the disease. As of Apr. 30, 2003, the US Centers for Disease Control and Prevention (CDC) has re-vised their surveillance case definitions for SARS to include laboratory criteria for evidence of infection3 (see Box [on next page] and Figure). Clinical implications: Serologic testing can be done using indirect fluorescent antibody or enzyme-linked immunosor-bent assays specific for SARS-CoV anti-body. Because some patients do not hav