Question 1

Which of the following characteristics of the skin microbiome helps prevent colonization by pathogenic microbes?

Accepted Answer

Production of chemicals that interfere with the growth of other microbes

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 is the most likely causative agent?

Accepted Answer

Streptococcus pyogenes

Question 3

Which of the following best explains why the skin is an effective barrier to microbial invasion?

Accepted Answer

The outer layers are dead and covered in salt

Question 4

A child develops red patches on the face that progress to pus-filled vesicles and crust over. Which of the following is the most likely diagnosis?

Accepted Answer

Impetigo

Question 5

Which virulence factor is produced by Staphylococcus aureus but not by Staphylococcus epidermidis, contributing to its increased pathogenicity?

Accepted Answer

Production of coagulase

Question 6

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

Accepted Answer

Pyocyanin

Question 7

Which of the following is the primary method of transmission for Rocky Mountain spotted fever?

Accepted Answer

Bite of an infected tick

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 best describes the pathogenesis of Staphylococcal Scalded Skin Syndrome (SSSS)?

Accepted Answer

Circulation of exfoliative toxins in the blood

Question 10

Which of the following is NOT a typical sign or symptom of a Pseudomonas aeruginosa infection?

Accepted Answer

Rash on the face and neck

Question 11

A patient with poorly controlled diabetes develops a rapidly spreading, intensely painful infection with tissue necrosis. Which organism is most likely responsible for necrotizing fasciitis in this scenario?

Accepted Answer

Streptococcus pyogenes

Question 12

Which of the following best describes shingles?

Accepted Answer

Reactivation of the chickenpox virus

Question 13

Which of the following is the most common species of Staphylococcus found on the skin?

Accepted Answer

Staphylococcus epidermidis

Question 14

Which of the following is the causative agent of cat scratch disease?

Accepted Answer

Bartonella henselae

Question 15

Which of the following is a key virulence factor of Streptococcus pyogenes that helps it evade the immune system?

Accepted Answer

M protein

Question 16

A patient presents with a rapidly progressing infection after a traumatic wound, with gas production and tissue necrosis. Which organism is most likely responsible?

Accepted Answer

Clostridium perfringens

Question 17

Which of the following best describes the pathogenesis of acne?

Accepted Answer

Blockage of hair follicles by sebum and dead cells, leading to bacterial growth

Question 18

Which of the following is the best initial treatment for Staphylococcus aureus folliculitis that is resistant to penicillin?

Accepted Answer

Vancomycin

Question 19

Which of the following statements about smallpox is TRUE?

Accepted Answer

It was eradicated through a global vaccination program

Question 20

Which of the following is a distinguishing feature of viral warts (papillomas) compared to bacterial skin infections?

Accepted Answer

They are caused by DNA viruses that induce rapid growth of skin cells

Ch 19 Microbial Diseases of the Skin and Wounds: Structure, Microbiome, and Pathogenesis

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