Microbiology: Streptococcus pyogenes Characteristics

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18 Questions

What is the main purpose of sensitivity to bacitracin in differentiating S.pyogenes from other hemolytic streptococci?

To distinguish S.pyogenes based on its reaction to the antibiotic

Which component of the S.pyogenes cell wall has been shown to have a toxic effect on connective tissue in experimental animals?

Group specific carbohydrate

What is the role of the M protein in Streptococcus pyogenes?

Inhibiting phagocytosis

Which Streptococcus group produces streptolysin O that is oxygen labile and requires a reduced form to be active?

Group C

What is the main function of the hyaluronic acid capsule in Streptococcus pyogenes?

Inhibiting phagocytosis

Which component of the Streptococcus pyogenes cell wall is responsible for its rigidity?


What type of streptococci are known as S.pyogenes?

Group A

Which protein antigen in S.pyogenes is acid and heat labile?

M protein

Which Lancefield group may be further subdivided by means of the agglutination test?

Group A

What type of colonies are produced by S.pyogenes on blood agar after 24 hours of incubation?

Small, circular, semitransparent colonies with clear haemolysis

At what temperature does S.pyogenes grow best?


Which type of streptococci is an aerobe and facultative anaerobe?


Which type of streptococci is generally commensal in the throat and produces a greenish discolouration with partial hemolysis around the colonies?

Oral Streptococci

Which type of streptococci is classified based on their hemolytic properties into alpha, beta, and gamma reactions?

Oral Streptococci

Which type of streptococci are generally associated with the production of greening or viridans due to their distinctive green color?


Which system of classification divides streptococci based on growth characteristics, type of hemolysis, and biochemical activities?

Oral Streptococci

Which type of streptococci is associated with the beta-hemolytic properties characterized by complete hemolysis around the colonies?

Oral Streptococci

Which streptococcus type recognized in the classification system is commonly found to be commensals in the throat?


This quiz covers the characteristics of Streptococcus pyogenes, focusing on its sensitivity to bacitracin, antigenicity, cell wall composition, and toxic effects on connective tissue. Test your knowledge on this important bacterium!

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