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Clinical Pediatrics, Vol. 25, No. 10, 496-502 (1986)
DOI: 10.1177/000992288602501003

Group C and Group G Streptococci

In-Office Isolation from Children and Adolescents with Pharyngitis

Richard H. Schwartz

Fairfax Hospital, Falls Church, Virginia

Stanford T. Shulman

Division of Infectious Diseases, The Children's Memorial Hospital, Department of Pediatrics, Northwestern University Medical School, Chicago, Illinois

The importance of non-group A streptococci as etiologic agents of acute pharyngitis in endemic circumstances is unclear. The authors attempted to clarify this issue in patients undergoing throat culture for acute pharyngitis in a suburban pediatric practice. Of 6,694 throat cultures, 2,243 (34%) yielded B-hemolytic streptococci, 83 percent (1,783) of which were bacitracin-sensitive and presumptive group A organisms. A random selection of 279 of the 460 bacitracin-resistant streptococci yielded 56 group C, 42 group G, 35 group F, 2 group A, and 3 mixed groups of streptococci.

Paired serologic specimens were obtained from 12 children with group C or G streptococci. Four of six group C subjects from whom paired serum specimens were obtained had a significant increase in anti-streptolysin O titer. However, no change in anti-C/G hyaluronidase or anti-C carbohydrate titer was observed. Similarly, two of six subjects with group G streptococci on throat culture in whom paired serum specimens were obtained showed an increase in ASO titer. No seroconversion to anti-C/G hyaluronidase, anti-C, or anti-G carbohydrates was demonstrated. Despite substantial clinical and circumstantial evidence, it could not be confirmed serologically that group C and G streptococci produced acute pharyngitis in this endemic setting.


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