At least, so says CBC Newsworld tonight (as in, five minutes ago). The health unit folks say they expect to see more. Also, they've called in the police to start ensuring that quarantines are observed.
I suspect that the reason they went from "it's all OK" to "close hospitals and quarantine" is because they knew that the confirmed cases were about to rise dramatically. As Dr. Cunha put it in today's press conference "the major vectors now are health workers and people in close personal contact with them" which is to say health workers in the two hospitals that have been completely closed and their families.
I've been reading the Garrett stuff too. Very interesting reading, albeit all US history; obviously, the development of public health infrastructure followed a very different path in Canada.
I think it's the very large differences between the two that have led to the different approaches to dealing with SARS on the two sides of the border. It will be very interesting to see how it plays out... there's a paper in there, that's for sure.