I hate to contradict quote that you will not be quarrantined for vomiting alone, but we were speaking with mother on CC during the 11/8 Magic cruise.
On Monday evening, her 8 year old DD ate too many chix strips and ff. Threw up once, but as a good person, she called the infirmary.
DD was quarrantined for 48 hours. Missed Grand Cayman and Cozumel.
She never threw up again, never had diarrhea, never had a fever, but the Dr. wasn't willing to take a chance. They are very concerned about the Norwalk this year. Don't want a repeat of last year.
So, sniffles, no, vomiting, yes.