Question 1

Which of the following is NOT a function of the skin?

Accepted Answer

Facilitates gas exchange with the environment

Question 2

A patient presents with a red, swollen, and hot area on their lower leg. The infection is diagnosed as cellulitis. Which of the following organisms is LEAST likely to be the cause?

Accepted Answer

Cutibacterium acnes

Question 3

Which virulence factor is present in Staphylococcus aureus but NOT in Staphylococcus epidermidis?

Accepted Answer

Coagulase

Question 4

A child develops red patches on the face that become pus-filled vesicles and crust over. Which of the following statements is TRUE regarding this condition?

Accepted Answer

It is called impetigo and is often seen in children in day care centers

Question 5

Which of the following best explains why most bacteria do not survive long on the skin?

Accepted Answer

The skin has a high salt concentration, sebum, and a slightly acidic pH

Question 6

A burn patient develops a blue-green discoloration at the wound site and later experiences fever and shock. Which virulence factor is responsible for the blue-green pigment?

Accepted Answer

Pyocyanin

Question 7

Which of the following is the most important initial step in the pathogenesis of necrotizing fasciitis caused by Streptococcus pyogenes?

Accepted Answer

Entry through breaks in the skin

Question 8

A patient presents with a black, painless ulcer after handling animal hides. Which organism is most likely responsible?

Accepted Answer

Bacillus anthracis

Question 9

Which of the following statements about the skin microbiome is CORRECT?

Accepted Answer

It competes with pathogens for nutrients and space

Question 10

A patient with a history of poorly controlled diabetes develops a rapidly spreading infection of the subcutaneous fat and deeper dermis. Which of the following is the most likely diagnosis?

Accepted Answer

Cellulitis

Question 11

Which of the following best describes the pathogenesis of Rocky Mountain spotted fever?

Accepted Answer

Rickettsia rickettsii invades endothelial cells, causing vascular leakage and petechiae

Question 12

Which of the following is a distinguishing feature of Staphylococcal Scalded Skin Syndrome (SSSS)?

Accepted Answer

It is caused by exfoliative toxins that result in the peeling of the outer epidermis

Question 13

A 17-year-old presents with multiple pustules on the face and back. Which organism is most commonly associated with this condition?

Accepted Answer

Cutibacterium acnes

Question 14

Which of the following is the primary method of preventing the spread of Methicillin-resistant Staphylococcus aureus (MRSA) in hospitals?

Accepted Answer

Hand antisepsis and proper hospital procedures

Question 15

A patient develops a non-itchy spotted rash on the trunk and appendages after a tick bite. Which diagnostic method is most appropriate?

Accepted Answer

Serological testing

Question 16

Which of the following best explains why Pseudomonas aeruginosa infections are difficult to treat?

Accepted Answer

The organism is resistant to most antimicrobials

Question 17

Which of the following is a key difference between impetigo and erysipelas?

Accepted Answer

Impetigo is limited to the epidermis, while erysipelas involves the lymph nodes and deeper dermis

Question 18

Which of the following is the most important preventive measure for gas gangrene?

Accepted Answer

Proper cleaning of wounds

Question 19

A patient presents with large, painless skin lesions after traveling to a tropical region. Microscopic examination reveals protozoa inside macrophages. What is the most likely diagnosis?

Accepted Answer

Leishmaniasis

Question 20

Which of the following best describes the role of the skin as a barrier to infection?

Accepted Answer

It provides a physical barrier and produces chemicals that inhibit microbial growth

Microbial Diseases of the Skin and Wounds: Structure, Microbiome, and Pathogenesis

Study Guide - Practice Questions

Study Guide - Flashcards