Mononucleosis is an infectious disease caused by the Epstein-Barr virus. Infected individuals develop a series of flu-like symptoms four to six weeks after coming into contact with the virus. Some people become infected but remain asymptomatic, while others require a few weeks to fully recover from their symptoms.
One of the first symptoms experienced by people with the Epstein-Barr virus is fatigue. Because symptoms can take four to six weeks to develop, it can be difficult to determine the precise cause of the infection. To make matters more confusing, symptoms are mild in the earlier stages, leading many people to believe they have caught a common cold or the flu. In some cases, the fatigue can linger for several months after the infection subsides.
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