Mononucleosis, often called "mono," is an illness caused by the Epstein-Barr virus. When mono occurs during adolescence or adulthood, symptoms are more severe --high fever that can last up to three weeks, swollen lymph glands in the back of the neck, and severe sore throat. Rare but major complications that can develop from mono include rupture of the spleen. Follow the links below to find WebMD's comprehensive coverage about how mononucleosis is contracted, what it looks like, how to treat it, and much more.
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