I've been pretty ill with Norovirus. Watching the men's curling, they have people dropping like flies with 'flu', I bet it is this same virus, as well.
The problem with Norovirus:
These viruses are relatively stable in the environment and can survive freezing and heating to 60°C (140°F).
It is highly communicable, and survives
Norovirus in Facilities Healthcare Sheet (CDC – PDF)
Wash your hands.
Stay home if you are sick.
We caught it a week after the kids had recovered. My son caught it two weeks later from the grandkids. IT is a horrible virus.