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Diseases of Upper Respiratory System: Streptococcal Pharyngitis and Diptheria

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Diseases of Upper Respiratory System: Streptococcal Pharyngitis and Diptheria

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Questions and Answers

What is the primary mechanism of immune evasion used by Streptococcus pyogenes in streptococcal pharyngitis?

Production of erythrogenic toxin

Activation of the complement system

Production of streptolysins

Resistance to phagocytosis (correct)

What is the primary cause of scarlet fever?

Streptococcus pyogenes producing streptokinase

Corynebacterium diphtheriae producing diphtheria toxin

Erythrogenic toxin produced by lysogenized S. pyogenes (correct)

Bordetella pertussis producing pertussis toxin

What is the primary mechanism of action of diphtheria toxin?

Formation of a membrane of fibrin, dead tissue, and bacteria

Damage to the walls of ciliated cells

Activation of the complement system

Inhibition of protein synthesis (correct)

What is the primary cause of otitis media?

Staphylococcus aureus and Streptococcus pyogenes (C) Signup and view all the answers

What is the primary characteristic of the paroxysmal stage of pertussis?

Violent coughing sieges (A) Signup and view all the answers

What is the primary way that Mycobacterium tuberculosis is transmitted?

From human to human through the air (B) Signup and view all the answers

What is the main cell type that Mycobacterium tuberculosis infects?

Macrophages (B) Signup and view all the answers

What is the purpose of the cell-mediated immune response in tuberculosis?

To activate macrophages to destroy the bacteria (B) Signup and view all the answers

What is the name of the vaccine commonly used to prevent tuberculosis?

BCG (B) Signup and view all the answers

What is the name of the type of tuberculosis that results from the spread of bacteria through the bloodstream?

Miliary tuberculosis (C) Signup and view all the answers