In February 2003, Sars – the first Sars – hit Toronto, carried back from Hong Kong by an elderly woman who’d been to a wedding. The outbreak was the largest and deadliest outside Asia, with 241 infections and 41 deaths over the next few months. A team at St John’s Rehab Hospital followed up with fifty patients reporting post-Sars symptoms. John Patcai, the hospital’s chief of staff, has made the comparison between long Sars and long Covid. The window he offers is small and narrow: as interest in Sars dwindled so did funding, and after a few years the group stopped their battery of physiological tests, continuing to record only the patients’ psychological state and self-reported complaints.