This is normal. By the age of 60, 60 percent of us have had it at some time in our life.

Most of the time, it's very mild, and it might be that they just didn't think about it. Or, maybe they were afraid of being sent to the hospital.

I anticipate there will be more illnesses.

That can take up to a week. It won't be definitive until then.

We are recommending that ill persons stay in their rooms.

It likely was brought in from outside, because it is common in the community. But we will never know for sure.