Pathogenic streptococci of the upper respiratory tract (such as Streptococcus pyogenes) are distinguished from non-pathogenic streptococci by

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Beta hemolytic activity is associated with pathogenic streptococci, including Streptococcus pyogenes. Non-pathogenic streptococci typically exhibit alpha hemolytic activity or no hemolytic activity. The presence or absence of a capsule or a lysogenic phage does not necessarily distinguish between pathogenic and non-pathogenic streptococci.

Pathogenic Streptococci of the Upper Respiratory Tract (Such as Streptococcus