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The mysterious illness has killed dozens of people, and infected thousands. Now it's spreading not only in Asia, but closer to home in parts of Canada.

Airlines at Sea-Tac are handing out warning cards to people headed into and out of areas hardest-hit by SARS, and questioning people who appear to be ill.

Eleven people have died in Hong Kong and more than 300 have been infected by what experts are calling a coronavirus.

Many people wear protective masks to avoid catching it. Schools are closed for a week to keep SARS from spreading through children and the Rolling Stones Hong Kong concerts this weekend are cancelled.

In Toronto, thousands could have been exposed to SARS. Health officials there are taking quarantine measures, asking people who've been to Toronto's Grace Hospital since March 16 to stay home for 10 days.

So far, no cases of SARS have been reported here in Seattle.

Airlines are in contact with the Centers of Disease Control, waiting to see if they need to do more than just warn passengers.

Previous Stories: March 18, 2003: Local Doctors Watch For Signs Of Mystery Illness March 17, 2003: Man Suffering Case Of Mystery Illness In B.C.