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Streptococci Virulence Factors Quiz

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Questions and Answers

What is the drug of choice for the treatment of Streptococcus pyogenes infections?

Penicillin G (correct)

Amoxicillin

Erythromycin

Vancomycin

Which test is used to confirm the identity of Streptococcus pyogenes?

Antibiotic susceptibility testing

Lancefield grouping and biochemical testing (correct)

Catalase test

Gram staining

What is the Lancefield group of Streptococcus pyogenes?

Group D

Group C

Group B

Group A (correct)

Which test is used to differentiate Streptococcus pyogenes from other streptococci?

PYR test Signup and view all the answers

Which surface proteins are used to further differentiate strains of Streptococcus pyogenes?

M, R, and T proteins Signup and view all the answers

What is the primary source of Streptococcus agalactiae (Group B Streptococcus) in humans?

Perineal and vaginal flora Signup and view all the answers

How can Streptococcus agalactiae (Group B Streptococcus) be transmitted?

Transvaginal and transplacental transmission Signup and view all the answers

Which of the following is a characteristic of the colonial morphology of Streptococcus pyogenes?

Beta-hemolytic Signup and view all the answers

What is the microscopic appearance of Streptococcus pyogenes?

Gram-positive cocci in chains Signup and view all the answers

What is the purpose of long-term antibiotic prophylaxis in patients with a history of rheumatic fever?

To prevent recurrence of rheumatic fever Signup and view all the answers