Infectious mononucleosis is a common infection caused by the Epstein-Barr virus (EBV). It is also known as glandular fever, the kissing disease, and mono. Symptoms of infectious mononucleosis include fatigue, sore throat, fever, and swollen lymph nodes. There is no treatment for mono, but supportive care involves resting and drinking plenty of fluids. The illness resolves without treatment, but symptoms may last from several weeks to months.