I just returned from a retreat center in the eastern part of Washington State. Five people in my group of 13 got sick with gastroenteritis. This is a new strain of what used to be known as the "Norfolk virus" (now called norovirus) and it is very contagious. It used to be found only in cruise ships, but it you look at web page titled "noroblog" you will see it's happening anywhere a group of people gathers to eat. The symptoms are violent vomiting, diarrhea, and sometimes fever. They dissapear in about 24 hrs.
I am telling this story not to be alarmist, but to share what kept me virus-free during those scary four days (I was there on a business trip). I washed my hands several times a day, did not hug or touch anyone, ate well-washed and cooked food, did not share foods, and did not visit anyone else's room. Suffering from GERD, and not having much acid in my system with which to fight an infection, you can imagine how worried I was.