Question 1

Which of the following mechanisms is primarily responsible for keeping the lower respiratory system nearly sterile?

Accepted Answer

Ciliary escalator action and alveolar macrophages

Question 2

A patient presents with a sore throat, fever, and enlarged lymph nodes. Rapid antigen detection tests reveal beta-hemolytic, bacitracin-sensitive colonies. What is the most likely causative agent?

Accepted Answer

Streptococcus pyogenes (Group A Streptococcus)

Question 3

Which bacterial toxin is responsible for the characteristic sandpaper-like rash and strawberry tongue in scarlet fever?

Accepted Answer

Erythrogenic toxin

Question 4

A tough grayish membrane in the throat that can block air passage is a hallmark of which disease, and what is the causative organism?

Accepted Answer

Diphtheria; Corynebacterium diphtheriae

Question 5

Which of the following is NOT a typical cause of otitis media in children?

Accepted Answer

Mycoplasma pneumoniae

Question 6

Why are antibiotics ineffective against the common cold?

Accepted Answer

The common cold is caused by viruses, not bacteria

Question 7

Which stage of pertussis is characterized by violent coughing fits followed by gasping for air?

Accepted Answer

Paroxysmal stage

Question 8

A patient with late-stage HIV infection develops a severe, generalized lung disease with yeast-like cells inside macrophages. Which pathogen is most likely responsible?

Accepted Answer

Histoplasma capsulatum

Question 9

Which of the following statements about tuberculosis is correct?

Accepted Answer

Latent TB is characterized by dormant bacilli in calcified tubercles (Ghon's complexes)

Question 10

Which equation best represents the concept of a low infectious dose (ID$$_{50}) $$for Q fever?

Accepted Answer

$$ID_{50} = 15$$

Question 11

Which feature distinguishes Mycoplasma pneumoniae from other bacterial causes of pneumonia?

Accepted Answer

It lacks a cell wall

Question 12

A patient develops pneumonia after cleaning a compost pile. Which fungal pathogen is most likely responsible?

Accepted Answer

Aspergillus fumigatus

Question 13

Which viral protein is responsible for the attachment of SARS-CoV-2 to host cells?

Accepted Answer

Spike (S) protein

Question 14

Which process leads to major changes in influenza virus antigens and is responsible for pandemics?

Accepted Answer

Antigenic shift

Question 15

A 3-year-old child presents with coughing and wheezing for more than a week. Which virus is most likely responsible?

Accepted Answer

Respiratory syncytial virus (RSV)

Question 16

Which of the following is a primary indicator of AIDS and is 100% fatal without treatment?

Accepted Answer

Pneumocystis pneumonia (PCP)

Question 17

Which of the following best explains why the conjugated pneumococcal vaccine is effective in preventing typical pneumonia?

Accepted Answer

It induces immunity against the capsule of S. pneumoniae

Question 18

A patient exposed to bird droppings develops pneumonia. Which diagnostic finding would most strongly suggest Coccidioides immitis infection?

Accepted Answer

Spherules filled with spores in tissue

Question 19

Which of the following treatments is most appropriate for a patient diagnosed with Legionnaires’ disease?

Accepted Answer

Azithromycin

Question 20

Which equation best represents the relationship between the number of RNA segments ($$n) $$and the potential for reassortment in influenza A virus?

Accepted Answer

$$n = 8$$

Microbial Diseases of the Respiratory System: Structure, Microbiota, and Major Pathogens

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