Mononucleosis, often referred to as “mono” or the “kissing disease,” is an infectious disease caused by a virus called Epstein-Barr. 
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Symptoms typically include fever, sore throat, swollen lymph nodes in the neck and fatigue. While mononucleosis is not typically serious, it can be severe and prolonged if left untreated. 

Mononucleosis is spread through contact with saliva, so it's important to practice good hygiene habits like washing hands regularly and avoiding sharing drinks or eating utensils. Avoiding close contact with people who have mononucleosis can also help prevent transmission of the virus. 

Diagnosing mononucleosis requires a physical exam and laboratory tests. Treatment generally includes rest, fluids and pain relievers to reduce fever and sore throat symptoms. Antibiotics may be prescribed if a bacterial infection is present or suspected.

Most people who have mononucleosis recover completely within two to four weeks without any long-term complications. In some cases, however, the virus can cause liver inflammation that may lead to jaundice or other complications such as spleen enlargement or extreme fatigue. Complications are rare but may require additional treatment. 

It's important to talk to your doctor if you think you might have mononucleosis so that you can receive the appropriate treatment. With prompt diagnosis and treatment, most people make a full recovery from this common viral infection with no lasting effects.