Home > Encyclopedia of Medicine > Infectious Mononucleosis

Definition

Infectious mononucleosis is a contagious illness caused by the Epstein-Barr virus, which can affect the liver, lymph nodes, and oral cavity. While mononucleosis is not usually a serious disease, its primary symptoms of fatigue and lack of energy can linger for several months.

Description

Infectious mononucleosis, frequently called "mono" or the "kissing disease," is caused by the Epstein-Barr virus (EBV) found in saliva and mucus. The virus affects a type of white blood cell called the B lymphocyte, producing characteristic atypical lymphocytes that may be useful in the diagnosis of the disease.

While anyone, even young children, can develop mononucleosis, it occurs most often in young adults between the ages of 15 and 35, and is especially common in teenagers. The mononucleosis infection rate among college students who have not...