what age group will infectious mono show up
Who Is Affected by Infectious Mononucleosis. Infectious mononucleosis (mono) occurs in about 1 out of 2,000 people every year. People between the ages of 15 and 24 are most likely to have symptoms of mono. Most people have been exposed to Epstein-Barr virus (EBV), which causes mono, by the time they reach adulthood.