Microbiology: Streptococcus pyogenes Characteristics

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

To identify the presence of lipoteichoic acid

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

To inhibit phagocytosis

To test cell wall rigidity

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 (correct)

Lipoteichoic acid

Peptidoglycan

Fimbria containing proteins

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

Inhibiting phagocytosis (correct)

Promoting phagocytosis

Enhancing toxin production

Strengthening the cell wall rigidity

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

Group C Signup and view all the answers

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

Inhibiting phagocytosis Signup and view all the answers

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

Peptidoglycan Signup and view all the answers

What type of streptococci are known as S.pyogenes?

Group A Signup and view all the answers

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

M protein Signup and view all the answers

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

Group A Signup and view all the answers

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

Small, circular, semitransparent colonies with clear haemolysis Signup and view all the answers

At what temperature does S.pyogenes grow best?

37°C Signup and view all the answers

Which type of streptococci is an aerobe and facultative anaerobe?

S.pyogenes Signup and view all the answers

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

Oral Streptococci Signup and view all the answers

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

Oral Streptococci Signup and view all the answers

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

S.pneumoniae Signup and view all the answers

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

Oral Streptococci Signup and view all the answers

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

Oral Streptococci Signup and view all the answers

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

S.salivarius Signup and view all the answers

Microbiology: Streptococcus pyogenes Characteristics

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Questions and Answers

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

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

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

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

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

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

What type of streptococci are known as S.pyogenes?

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

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

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

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?

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

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?

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

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

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