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General Properties of Gram Positive Streptococci

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General Properties of Gram Positive Streptococci

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Questions and Answers

Which of the following is NOT a virulence factor of Streptococcus pyogenes?

Endotoxin (correct)

Hyaluronic acid capsule

M protein

Streptokinase

What is the primary mechanism by which the hyaluronic acid capsule contributes to the virulence of Streptococcus pyogenes?

It provides resistance to phagocytosis by the host's immune cells. (correct)

It increases the permeability of the host's tissues, facilitating spread of infection.

It produces a toxin that damages host cells.

It allows the bacteria to adhere to host cells more effectively.

Which of the following complications is associated with a type III hypersensitivity reaction to Streptococcus pyogenes infection?

Erythema nodosum

Glomerulonephritis (correct)

Rheumatic fever

Scarlet fever

Which of the following enzymes produced by Streptococcus pyogenes contributes to the characteristic 'spreading' of the infection?

Hyaluronidase Signup and view all the answers

What is the most common treatment for Streptococcus pyogenes infections?

Penicillin Signup and view all the answers

What is the Lancefield group of Streptococcus pyogenes?

A Signup and view all the answers

How is the Lancefield group of Streptococcus determined?

By antiserum against cell wall polysaccharide Signup and view all the answers

What type of infection does Streptococcus agalactiae cause?

In neonates Signup and view all the answers

Which Lancefield group ranks next to group A in causing human disease?

D Signup and view all the answers

What is the characteristic growth pattern of Streptococcus pyogenes on blood agar?

Halo of β-hemolysis Signup and view all the answers