Most cases of pharyngitis occur during the colder months and are primarily caused by:

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Most cases of pharyngitis occur during the colder months and often accompany other infections, primarily those caused by viruses.Patients with respiratory tract infections caused by influenza types A and B, parainfluenza, coxsackie A, rhinoviruses, or coronaviruses frequently complain of a sore throat.Pharyngitis, often with ulceration, is also commonly found in patients with infectious mononucleosis caused by either the Epstein-Barr virus or by cytomegalovirus.Although less common, pharyngitis caused by adenovirus or herpes simplex virus is clinically severe.Finally, acute retroviral syndrome caused by human immunodeficiency virus-1 (HIV-1)is associated with acute pharyngitis.

Most Cases of Pharyngitis Occur During the Colder Months and Are