I wouldn't worry about Toronto
If in the next week you continue to hear about isolated cases, but there is no sign in Hong Kong and Singapore of thousands getting sick, and there aren't a long list of cities popping up from which vectors seem to originate, then it almost certainly is contained.
I would personally be concerned if there is a city somewhere which is reporting thousands rather than hundreds. Or if the number of cities with outbreaks of a hundred or so keeps on growing. Either would indicate to me that despite public health efforts, it is continuing to grow towards a critical mass.
So if in a week there are 100 cases in Toronto but no new big centers of outbreak get reported, I would be comfortable. If in a week Toronto is clearly under control but Hong Kong is not, I would be worried.
Also I would like to note that being in a city of millions with an outbreak of hundreds is a small risk. Unless, of course, you are either working in the medical field or the outbreak takes off.
Cheers,
Ben
