Nonstreptococcal pharyngitis.

Area of Science:

• Pediatric infectious diseases
• Microbiology
• Clinical diagnostics

Background:

• Pharyngitis is a frequent pediatric diagnosis in the U.S.
• Group A ß-hemolytic streptococci (GAS) cause only about 30% of symptomatic pharyngitis cases.
• The remaining 70% are attributed to diverse pathogens, including other bacteria and viruses.

Purpose of the Study:

• To review evidence implicating non-GAS ß-hemolytic streptococci, other bacteria, and viruses in pharyngitis.
• To provide diagnostic and management recommendations for pharyngitis caused by these alternative pathogens.

Main Methods:

• Literature review of studies on bacterial and viral pharyngitis.
• Analysis of evidence for causative roles in sporadic and outbreak cases.
• Synthesis of current diagnostic and treatment guidelines.

Main Results:

• Evidence supports the role of various pathogens beyond *Streptococcus pyogenes* in pharyngitis.
• Specific bacterial and viral agents are frequently implicated in the remaining 70% of cases.
• Outbreaks and sporadic infections involve a spectrum of microorganisms.

Conclusions:

• Diagnosis and management of pharyngitis should consider pathogens beyond *S. pyogenes*.
• Updated recommendations are needed for comprehensive pharyngitis care.
• Further research may clarify the etiology of undiagnosed pharyngitis cases.