While usually caused by Epstein—Barr virus, also known as human herpesvirus 4, which is a member of the herpes virus family ,  a few other viruses may also cause the disease. There is no vaccine for EBV, but infection can be prevented by not sharing personal items or saliva with an infected person. Mono most commonly affects those between the ages of 15 to 24 years in the developed world. The signs and symptoms of infectious mononucleosis vary with age. Before puberty, the disease typically only produces flu -like symptoms, if any at all. When found, symptoms tend to be similar to those of common throat infections mild pharyngitis , with or without tonsillitis.
Infectious Mononucleosis (Mono) in Teens and Young Adults
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US Pharm. Infectious mononucleosis IM was first described in as glandular fever, a clinical illness characterized by fever, fatigue, abdominal discomfort, hepatosplenomegaly enlargement of both the liver and spleen , and lymphadenopathy. Later observations linking the appearance of atypical lymphocytosis helped to establish IM as a clinical entity.
It may also be caused by cytomegalovirus CMV. Mono is most often spread by contact with infected spit saliva. But it can also be spread through blood or other body fluids. It's hard to keep it from spreading because even people with no symptoms can carry the virus in their saliva and infect other people.