Podcast
Questions and Answers
What is the main purpose of sensitivity to bacitracin in differentiating S.pyogenes from other hemolytic streptococci?
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?
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?
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?
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?
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?
Which component of the Streptococcus pyogenes cell wall is responsible for its rigidity?
What type of streptococci are known as S.pyogenes?
What type of streptococci are known as S.pyogenes?
Which protein antigen in S.pyogenes is acid and heat labile?
Which protein antigen in S.pyogenes is acid and heat labile?
Which Lancefield group may be further subdivided by means of the agglutination test?
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?
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?
At what temperature does S.pyogenes grow best?
Which type of streptococci is an aerobe and facultative anaerobe?
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 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 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 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 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 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?
Which streptococcus type recognized in the classification system is commonly found to be commensals in the throat?
