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Eur J Pediatr. 1991 Sep;150(11):776-9.

Beta-haemolytic non-group A streptococci and pharyngitis: a case-control study.

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Department of Pathology, University of British Columbia, Vancouver, Canada.


A case-control study was conducted to examine the association of beta-haemolytic non-group A streptococci and pharyngitis in a paediatric population (n = 502). No association could be found between disease and traditional Lancefield groups B, C, F, or G. When the analysis included the clustering of genetically related subgroups from different Lancefield groups, an association was evident for moderate and heavy quantitations of beta-haemolytic "large colony" group C and G streptococci (Streptococcus equisimilis and human biotypes of large colony group G streptococci) (p = 0.021). This study further defines a subset of the beta-haemolytic non-group A streptococci that merit recognition by both the laboratory and physician.

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