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The infection is spread via saliva and has an incubation period
of 4–7 weeks.Symptoms usually persist for 2–3 weeks, but fatigue
is often more prolonged.
The most contagious period lasts about 6 weeks after the beginning of symptoms.
Some studies indicate that a person can spread the infection for many months after the symptoms are completely gone, one particular study indicating as long as 18 months.