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Mononucleosis is an acute infectious disease that affects the respiratory system, the liver, and the lymphatic system. It is caused by the Epstein-Barr virus. It is common in children and young adults. It is spread by close contact such as kissing, sharing food or utensils, and by coughing. Symptoms can appear from 10 to 30 days after exposure. It is easily detected with a blood test.

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