Severe Vomiting and Stomach Pain: When to Seek Medical Help & Prevent Contagion

Question
Hi,
I am a college freshman, and today a girl on our floor became extremely ill with vomiting and stomach pain. She can't keep down anything, even water. When should she see a doctor?
Also, if she has a virus, how contagious is it? We have been cleaning the doorknobs and things to try to prevent anyone else getting sick. Is there anything else we can do to help prevent more people getting sick?
Thanks!

Answer
When should she see a doctor? Today if it is not improving.

Also, if she has a virus, how contagious is it?
Usually not so contagious unless you share glasses and eat after each other.

Is there anything else we can do to help prevent more people getting sick? Sounds like you are doing a great job.

You all may want to start taking a multivitamin daily,
plus vit C and High potency B complex twice a day to improve everyones resistance.

Target has these on clearance this week at a good price.