Classification of Streptococcus Bacteria Quiz

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12 Questions

Which Streptococcus species shows growth inhibition by bacitracin?

S. pyogenes

What is the most important virulence factor in Streptococcus pyogenes?

M protein

Which type of haemolysis is seen in Streptococcus pneumoniae?

Alpha-haemolytic

Which enzyme is used for emergency therapy of myocardial infarction by Streptococcus pyogenes?

Streptokinase

Which Streptococcus species is associated with scarlet fever?

S. pyogenes

What role do Streptococcal pyrogenic exotoxins play in infections by S. pyogenes?

Act as superantigens

What is the common symptom of pharyngitis caused by S.pyogenes?

Pain, redness, and swelling of posterior pharynx

Which toxin produced by S.pyogenes is responsible for causing scarlet fever?

SPE-A

How is the diagnosis of pharyngitis due to S.pyogenes confirmed in the laboratory?

Detection of Lancefield group A antigen using a latex agglutination test

What is the mechanism by which streptococcal M serotypes cause acute rheumatic fever?

Formation of antibodies to streptococcal M protein

What type of hypersensitivity reaction is responsible for acute glomerulonephritis caused by nephritogenic streptococcal M serotypes?

Type III hypersensitivity

Which age group is more commonly affected by acute rheumatic fever compared to acute glomerulonephritis?

Children between 4-30 years

Test your knowledge on the classification of Streptococcus bacteria based on characteristics like haemolysis on blood agar and cell wall carbohydrate antigen groups. Identify important species like S. pyogenes and S. agalactiae.

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