WebMD Answers
Mono is caused by the Epstein-Barr virus (EBV). You are at increased risk of getting mono if you:
After you have been infected with EBV, the virus may stay in your body for the rest of your life. But you will not get mono again.
EBV is not spread through the air. You can live with a person who has mono and never become infected with the virus.
Most people have been infected with EBV before, so they usually don't get mono when exposed to a person who has it.
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