Not sure 36 hrs after eating, my son threw up for 6 hours in the middle of the night. No fever but vomited a lot. Then 48 hrs after that, myself and other son got sick in the middle of the night. I had diarrhea for 21 hrs and body aches and my son threw up a lot for 6 hrs. 48 hrs after that, my son who got sick first threw up in the middle of the night one time. My second son started having diarrhea 4 days after he first threw up. We have all lost weight and could hardly function.