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Infectious mononucleosis
Infectious mononucleosis (IM; also known as mono, glandular fever, Pfeiffer's disease, Filatov's disease, and sometimes colloquially as the kissing disease from its transmission by saliva) is an infectious, widespread viral disease most commonly caused by the Epstein–Barr virus (EBV), one type of herpes virus, against which over 90% of adults are likely to have acquired immunity by the age of 40.〔〔 Occasionally, the symptoms can reoccur at a later period.〔 Most people are exposed to the virus as children, when the disease produces no noticeable or only flu-like symptoms. In developing countries, people are exposed to the virus in early childhood more often than in developed countries. As a result, the disease in its observable form is more common in developed countries. It is most common among adolescents and young adults.
Especially in adolescents and young adults, the disease is characterized by fever, sore throat and fatigue, along with several other possible signs and symptoms. It is primarily diagnosed by observation of symptoms, but suspicion can be confirmed by several diagnostic tests. It is generally a self-limiting disease, and little treatment is normally required.
==Signs and symptoms==
The signs and symptoms of infectious mononucleosis vary with age. The exact length of time between infection and symptoms is unclear. A review of the literature made an estimate of 33–49 days.〔 In adolescents and young adults, symptoms are thought to appear around 4–6 weeks after initial infection. Onset is often gradual, though it can be abrupt. The main symptoms may be preceded by 1–2 weeks of fatigue, feeling unwell and body aches.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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