I have to survey several people about what they would do if their roommate falls ill. Do colleges have extra dorms you can go to if you want to avoid the sickness? If your roommate is sick, can he/she be sent off to an sick wing of shorts to spend the night so you don't get it? What did you/would you do if this happend to you?

Most dorms don't have extra rooms for this purpose. You might bunk for a few nights in someone else's room -- even if it's in a sleeping bag on the floor. Above all, keep yourself healthy with proper food and plenty of sleep.