What is pharyngitis (sore throat)?

Updated: May 06, 2020
  • Author: John R Acerra, MD; Chief Editor: Jeter (Jay) Pritchard Taylor, III, MD  more...
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Answer

Pharyngitis is defined as an infection or irritation of the pharynx or tonsils (see the image below). The etiology is usually infectious, with most cases being of viral origin and most bacterial cases attributable to group A streptococci (GAS). Other causes include allergy, trauma, toxins, and neoplasia. The group A beta-hemolytic streptococcal (GABHS) rapid antigen detection test is the preferred method for diagnosing GAS infection in the emergency department because of difficulties with culture follow-up. [1]

Posterior pharynx with petechiae and exudates in a Posterior pharynx with petechiae and exudates in a 12-year-old girl. Both the rapid antigen detection test and throat culture were positive for group A beta-hemolytic streptococci.

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