Question 1

Which of the following structures is directly attached to the alveoli in the lower respiratory tract?

Accepted Answer

Bronchioles

Question 2

Which of the following is NOT a natural defense mechanism of the respiratory tract?

Accepted Answer

Endospores

Question 3

A patient presents with a sore throat, fever, and a sandpaper-like rash. Which toxin is most likely responsible for the rash?

Accepted Answer

Erythrogenic toxin

Question 4

Which of the following organisms is a common member of the normal biota of the upper respiratory tract and can also cause serious disease?

Accepted Answer

Staphylococcus aureus

Question 5

Which virulence factor of Streptococcus pyogenes helps it resist phagocytosis and adhere to the pharyngeal epithelium?

Accepted Answer

M protein

Question 6

A 7-year-old child develops acute otitis media following a viral upper respiratory infection. Which of the following is the most likely bacterial cause?

Accepted Answer

Streptococcus pneumoniae

Question 7

Which of the following statements best describes antigenic shift in influenza viruses?

Accepted Answer

It results from RNA exchange between different influenza viruses during coinfection.

Question 8

A patient with a history of HIV presents with pneumonia. Sputum analysis reveals a fungus that is not susceptible to traditional antifungal drugs due to its unique cell wall. What is the most likely causative agent?

Accepted Answer

Pneumocystis (carinii) jiroveci

Question 9

Which of the following is the leading cause of community-acquired bacterial pneumonia?

Accepted Answer

Streptococcus pneumoniae

Question 10

A 25-year-old patient develops a severe sore throat that progresses to Lemierre’s syndrome. Which bacterium is most likely responsible?

Accepted Answer

Fusobacterium necrophorum

Question 11

Which of the following is a recommended prevention strategy for healthcare-associated pneumonia in ventilated patients?

Accepted Answer

Elevating the patient’s head to a 30- to 45-degree angle

Question 12

Which of the following is a key difference between antigenic drift and antigenic shift in influenza viruses?

Accepted Answer

Antigenic shift can lead to pandemics, while antigenic drift leads to seasonal epidemics.

Question 13

A patient with tuberculosis is found to have a strain resistant to both isoniazid and rifampin. What is the most likely diagnosis?

Accepted Answer

Multidrug-resistant TB (MDR-TB)

Question 14

Which of the following is a function of the normal biota in the respiratory tract?

Accepted Answer

Microbial antagonism

Question 15

A 3-year-old child is brought to the clinic with a runny nose, sneezing, and a scratchy throat. Which of the following is the most likely causative agent?

Accepted Answer

Rhinovirus

Question 16

Which of the following is a major virulence factor of Mycobacterium tuberculosis that enhances its survival in the environment and within macrophages?

Accepted Answer

Mycolic acids and waxes in the cell wall

Question 17

Which of the following diagnostic tests is used to detect latent tuberculosis infection?

Accepted Answer

Mantoux test (tuberculin skin test)

Question 18

Which of the following vaccines has significantly reduced the incidence of acute otitis media in children?

Accepted Answer

Prevnar

Question 19

A patient with a history of chronic alcohol abuse is at increased risk for which of the following respiratory infections?

Accepted Answer

Community-acquired pneumonia caused by Streptococcus pneumoniae

Question 20

Which of the following is a recommended treatment for pharyngitis caused by Streptococcus pyogenes in a patient with a penicillin allergy?

Accepted Answer

Cephalexin

Infectious Diseases Affecting the Respiratory System: Anatomy, Defenses, and Pathology

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