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Laboratory criteria
| Confirmed |
| Antibody to SARS-CoV in specimens obtained during acute illness or > 28 days after illness onset, or |
| SARS-CoV RNA by RT-PCR, confirmed by a second PCR assay using a second aliquot of the specimen and a different set of PCR primers, or |
| Isolation of SARS-CoV |
| Negative |
| Absence of antibody to SARS-CoV in convalescent serum obtained > 28 days after symptom onset |
| Undetermined |
| Laboratory testing not performed or incomplete |
