Definition

Infectious mononucleosis is caused by the Epstein-Barr virus, which in teenagers and young adults may result in acute symptoms that last for several weeks. Fatigue and low energy can linger for several months.

Description

Infectious mononucleosis (IM), also called mono or glandular fever, is commonly transmitted among teenagers and young adults by kissing or sexual activity; hence it is sometimes called the "kissing disease."

By age 35–40, approximately 95% of the population has been infected with the Epstein-Barr virus (EBV) that causes IM. Although anyone can develop mononucleosis, primary (first) infections commonly occur in young adults between the ages of 15 and 35. Symptoms of IM are particularly common in teenagers. In the developed world, 15–20% of people are infected during adolescence and about half of...