Question 1

Which of the following best describes the genome of the influenza virus?

Accepted Answer

Single-stranded RNA, segmented

Question 2

A patient presents with a sore throat, fever, and swollen tonsils. A rapid strep test is positive. Which virulence factor of Streptococcus pyogenes is most responsible for adherence to tissue and evasion of phagocytosis?

Accepted Answer

M protein

Question 3

Which respiratory pathogen is most commonly associated with the development of Reye’s syndrome in children when aspirin is used for treatment?

Accepted Answer

Influenza virus

Question 4

What is the primary route of transmission for Bordetella pertussis?

Accepted Answer

Respiratory droplets

Question 5

Which diagnostic test is most appropriate for confirming active tuberculosis infection?

Accepted Answer

PPD skin test (Mantoux test)

Question 6

A 5-year-old child develops a high fever, red rash, and a 'strawberry' tongue. Which toxin is responsible for these symptoms in scarlet fever?

Accepted Answer

Erythrogenic toxin

Question 7

Which of the following pathogens is an obligate aerobe, acid-fast bacillus, and causes granuloma formation in the lungs?

Accepted Answer

Mycobacterium tuberculosis

Question 8

Which of the following is a major complication of Neisseria meningitidis infection that can lead to death within hours?

Accepted Answer

Waterhouse-Friderichsen syndrome

Question 9

Which vaccine is recommended for prevention of pertussis in children under 7 years old?

Accepted Answer

DTaP vaccine

Question 10

Which of the following pathogens is most likely to cause pneumonia as a secondary infection following influenza?

Accepted Answer

Staphylococcus aureus

Question 11

Which of the following statements about antigenic drift and shift in influenza virus is correct?

Accepted Answer

Antigenic drift involves minor mutations, while antigenic shift involves major changes in HA and/or NA glycoproteins.

Question 12

A patient with a history of chickenpox develops a painful rash along a single dermatome. Which virus is responsible for this condition?

Accepted Answer

Varicella zoster virus

Question 13

Which of the following is a recommended treatment for Streptococcus pyogenes pharyngitis?

Accepted Answer

Penicillin

Question 14

Which pathogen is most likely to cause croup (laryngotracheobronchitis) in children?

Accepted Answer

Parainfluenza virus

Question 15

Which of the following is a characteristic of Streptococcus pneumoniae?

Accepted Answer

Alpha-hemolytic, encapsulated, Gram positive diplococcus

Question 16

Which of the following is the most common cause of the common cold?

Accepted Answer

Rhinovirus

Question 17

A patient presents with fever, headache, stiff neck, and a blue-black petechial rash. Which diagnostic test would best confirm Neisseria meningitidis infection?

Accepted Answer

Isolation of Gram negative diplococci from CSF

Question 18

Which of the following is a recommended prevention strategy for influenza virus?

Accepted Answer

Seasonal killed virus vaccine

Question 19

Which pathogen is most likely to cause meningitis with a high mortality rate and is diagnosed by isolating alpha-hemolytic, optochin-sensitive colonies?

Accepted Answer

Streptococcus pneumoniae

Question 20

Which of the following is a major virulence factor of Bordetella pertussis that impairs phagocytosis?

Accepted Answer

Pertussis toxin (Ptx)

Respiratory Infections: Major Pathogens, Syndromes, and Clinical Management

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