Tests that identify IgM specific for EBV capsid antigen can confirm acute EBV infection, but are done in referral laboratories. If, early in suspected IM, a kit test for HA is negative, repeat it in 1 week. In adolescents and young adults, the illness that best mimics IM is cytomegalovirus infection. In my experience, the latter tends to be characterized by milder pharyngitis and more severe hepatitis. There is no reason to believe that athletes or active people are either more or less vulnerable to IM than are their nonathletic peers.
Afternoon naps help.
Most patients are well in 4 to 6 weeks, but the elite athlete may not regain top form for 3 to 6 months. Antibiotics and corticosteroids are indicated only for complications. Most of these possible indications are based on anecdotal reports rather than controlled studies. The best case for using corticosteroids is impending airway obstruction from tonsillopharyngitis. Corticosteroids can sharply reduce edema and hyperplasia of the tonsils, relieving obstruction and respiratory distress.