Overview. Infectious mononucleosis (mono) is often called the kissing disease. The virus that causes mono (Epstein-Barr virus) is spread through saliva. You can get it through kissing, but you can also be exposed by sharing a glass or food utensils with someone who has mono.
Mononucleosis classically presents with fever, lymphadenopathy, and tonsillar pharyngitis. The term “infectious mononucleosis” was first used in the 1920s to describe a group of students with a similar pharyngeal illness and blood laboratory findings of lymphocytosis and atypical mononuclear cells. It was only later that Epstein-Barr virus (EBV) was established as the cause of mononucleosis after an exposed healthcare worker developed a positive heterophile test.