Question: what do you do if you have been exposed to mono?
Answer: Drink plenty of water and fruit juices. Fluids help relieve a fever and sore throat and prevent dehydration.
Take an over-the-counter pain reliever. Use pain relievers such as acetaminophen (Tylenol, others) or ibuprofen (Advil, Motrin IB, others) as needed. ... 
Gargle with salt water.