Fig. 1: Timeline of the SARS outbreak at York Central Hospital (YCH), Richmond Hill, Ont., from Mar. 7, 2003, to Apr. 11, 2003. The period of unprotected exposure extends from the admission of the first SARS case to YCH on Mar. 16, 2003, to the implementation of hospital-wide respiratory isolation and barrier precautions. That index patient's exposure and first and second admission to hospital were at Scarborough Hospital, Grace Division, Toronto. Photo: Myra Rudakewich