Risk Factors for SARS among Persons without Known Contact with SARS Patients, Beijing, China
Risk Factors for SARS among Persons without Known Contact with SARS Patients, Beijing, China
Abstract Most cases of severe acute respiratory syndrome (SARS) have occurred in close contacts of SARS patients. However, in Beijing, a large proportion of SARS cases occurred in persons without such contact. We conducted a case-control study in Beijing that compared exposures of 94 unlinked, probable SARS patients with those …