How do you know? I was horribly ill last Tuesday for about 5 hours. Missed a week of work, got horribly dehydrated and haven't been able to eat anything without getting a stomach ache since. It's now Sunday, and still can only eat rice crackers...I've lost 10 lbs, awesome, but would have rather skipped the gross part. When will I feel better??!! No one in the house (knock on wood) has gotten it.... Praying they don't!