• One to one contact (with a norovirus-infected person) can occur by begin in the immediate vicinity while someone is vomiting, which suggests that there is an airborne risk. It can also occur when caring for an infected person or using the same utensil to share food with an infected person. It can even occur when shaking hands (this explains why some staff on cruise ships has been known to replace the ritual of shaking hands with touching elbows).