Mononucleosis
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Mononucleosis, also called "mono," is an acute illness most commonly caused
by the Epstein-Barr virus (EBV).
The Epstein-Barr virus can only be found in humans, but
it is
present throughout the world.
In the United States, mono is seen more often during
late childhood or early adulthood. Approximately 95% of the adults
in the U.S. have been infected by the time they reach 40 years old.
Once infected with EBV, a person will develop a strong immunity,
making it very unlikely to develop mono again.
The virus can be present in a person's saliva without causing any
illness.
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