In 2003, Toronto was the North American center for Severe Acute Respiratory Syndrome (SARS). The disease spread through the city’s hospitals before anyone knew what was happening. Dr Allison McGeer was a clinician caring for SARS patients and ultimately was infected herself. She describes her experience as a patient and provider and reviews lessons learned that might help others manage their regional COVID-19 outbreaks. Related: Supporting the Health Care Workforce During the COVID-19 Global Epidemic