Norovirus used to be called Norwalk-like virus.
It basically does the same thing Norwalk does.
Both Norovirus and Norwalk virus affect schools, cruise-ships, offices, hotels, etc etc etc year after year.
We only HEARD about it this year, because we were in a low news cycle when the cruise-illnesses occurred. According to the CDC, cruise illnesses this past winter occurred at similar rates of past winters. We only HEARD about it more this year because the media decided it was suddenly an important issue (there was no other news to report... we were between elections and wars).