As I said, the next week or so will tell the tale. It's been reported that the family that was sick made two separate visits to emerg before they were taken in; it was only on their third visit that they were admitted and put into isolation. If it's as infectious as it appears, that could mean major numbers of people have been exposed. OTOH, now that the health unit there knows what they're dealing with, they're taking all reasonable steps to find people who may have been exposed and bringing them in.