March 7, 2003
When Tse Chi-kwai arrived by ambulance at Toronto's Scarborough Grace Hospital, the nurses and doctors who cared for him as he struggled for breath had no idea of the threat he harboured in his lungs.
Two days earlier, the 43-year-old patient's mother, Kwan Sui-chu, had died at home of a respiratory illness she contracted at a Hong Kong hotel, making her Canada's patient zero in the outbreak of a baffling new infectious disease.
The World Health Organization later
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