Mononucleosis epidemiology and demographics
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Lakshmi Gopalakrishnan, M.B.B.S. [2]
Overview
Epstein-Barr virus occurs worldwide, and most people become infected with EBV sometime during their lives. In the United States, as many as 95% of adults between 35 and 40 years of age have been infected. Infants become susceptible to EBV as soon as maternal antibody protection (present at birth) disappears. Many children become infected with EBV, and these infections usually cause no symptoms or are indistinguishable from the other mild, brief illnesses of childhood. In the United States and in other developed countries, many persons are not infected with EBV in their childhood years. When infection with EBV occurs during adolescence or young adulthood, it causes infectious mononucleosis 35% to 50% of the time.
Epidemiology and Demographics
Mononucleosis is typically transmitted from asymptomatic individuals through blood or saliva (hence "the kissing disease"), or by sharing a drink, or sharing eating utensils. The disease is far less contagious than is commonly thought. In rare cases a person may have a high resistance to infection.
The disease is so-named because the count of mononuclear leucocytes (white blood cells with a one-lobed nucleus) rises significantly. There are two main types of mononuclear leucocytes: monocytes and lymphocytes. They normally account for about 35% of all white blood cells. With infectious mononucleosis, this can rise to 50-70%. Also, the total white blood count may increase to 10,000-20,000 per cubic millimeter.