Question 1

Which of the following is NOT a defense mechanism of the skin against microbial invasion?

Accepted Answer

Neutral pH of the skin surface

Question 2

A patient presents with a widespread eruption of small, fluid-filled lesions on the trunk and limbs. Which term best describes these lesions?

Accepted Answer

Vesicle

Question 3

Which of the following statements about the chickenpox (varicella-zoster) virus is TRUE?

Accepted Answer

It can become latent in peripheral nerves and reactivate as shingles

Question 4

Which of the following best explains why smallpox was eradicated globally?

Accepted Answer

A highly effective WHO vaccination program eliminated human cases

Question 5

A child develops a honey-colored crusted lesion around the mouth after scratching a vesicular rash. Which bacterial infection is most likely responsible?

Accepted Answer

Staphylococcus aureus impetigo

Question 6

Which virulence factor produced by Staphylococcus aureus allows it to evade the immune system by clotting blood?

Accepted Answer

Coagulase

Question 7

A burn patient develops a wound with a blue-green pigment and a fruity odor. Which organism is most likely responsible?

Accepted Answer

Pseudomonas aeruginosa

Question 8

Which of the following is a distinguishing feature of bacterial conjunctivitis compared to viral conjunctivitis?

Accepted Answer

Pus-like (yellow or green) discharge

Question 9

A patient presents with a painless, blackened ulcer on the skin after handling animal hides. Which organism is the most likely cause?

Accepted Answer

Bacillus anthracis

Question 10

Which of the following best describes a maculopapular rash?

Accepted Answer

Small, slightly raised, and not fluid-filled lesions overlaying flat discolored areas

Question 11

A patient with a history of cold sores develops eye pain, blurred vision, and watery discharge. Which is the most likely diagnosis?

Accepted Answer

Herpetic keratitis

Question 12

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

Accepted Answer

Propionibacterium acnes

Question 13

A patient presents with a scaly, ring-shaped lesion on the body. Which type of infection is most likely?

Accepted Answer

Dermatophyte (tinea corporis) infection

Question 14

Which of the following is a common complication of measles (rubeola)?

Accepted Answer

Permanent brain damage due to encephalitis

Question 15

A patient develops a large, painless ulcer at the site of a sand fly bite in the tropics. Which disease is most likely?

Accepted Answer

Cutaneous leishmaniasis

Question 16

Which of the following is a recommended prevention strategy for trachoma?

Accepted Answer

Frequent hand and face washing

Question 17

Which of the following best describes the role of lysozyme in the skin and eyes?

Accepted Answer

It breaks down peptidoglycan in bacterial cell walls

Question 18

A patient with diabetes develops a rapidly spreading, foul-smelling wound with gas bubbles in the tissue. Which is the most likely causative agent?

Accepted Answer

Clostridium perfringens

Question 19

Which of the following is a key difference between HSV-1 and varicella-zoster virus latency?

Accepted Answer

HSV-1 becomes latent in the trigeminal nerve, while varicella-zoster becomes latent in peripheral nerves

Question 20

Which of the following is the best treatment for cutaneous candidiasis?

Accepted Answer

Topical or oral antifungals and keeping the area dry

Microbiology of Skin and Eye Infections: Structure, Defenses, and Pathogens

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