Infectious mononucleosis is characterized by which symptom?

Infectious mononucleosis, commonly caused by the Epstein-Barr virus, is characterized prominently by the presence of white or purplish tonsillar exudate. This symptom occurs due to the inflammation and infection of the tonsils, leading to the development of patches that can have a white or purplish appearance. This exudate is a key indicator that helps differentiate infectious mononucleosis from other conditions that may present with similar symptoms, such as pharyngitis or strep throat.

Fever, while a common symptom associated with infectious mononucleosis, is not as distinctive as the presence of tonsillar exudate. Similarly, a red rash and severe headache can occur in various conditions and are not specific indicators of infectious mononucleosis. The hallmark of this illness, specifically the characteristic tonsillar exudate, is critical for diagnosis and management.