Infectious Disorders

Question 1

What is the superficial bacterial skin infection that is often caused by S. aureus or S. Pyogenes?

Answer 1

Impetigo

Question 2

A patient presents with an erythematous pustules on the face. The patient reports that the some pustules have ruptured and a dry, crusted, honey-colored serum was discharged. Laboratory results concluded that the superficial skin infection was due to S. aureus. What is the most likely diagnosis?

Answer 2

Impetigo

Question 3

A deep infection that presents as red, tender, swollen rash with a fever. The infection is usually caused by S. aureus or S. pyogenes. What is this infection?

Answer 3

Cellulitis

Question 4

What are the risk factors for the development of cellulitis?

Answer 4

Surgery
Trauma
Insect bite

Question 5

What can cellulitis progress into?

Answer 5

Necrotizing fasciitis

Question 6

Necrosis of subcutaneous tissue that is due to an anaerobic flesh-eating bacteria and is preempted by cellulitis?

Answer 6

Necrotizing fasciitis

Question 7

What leads to crepitus seen with necrotizing fasciitis?

Answer 7

Production of CO2

Question 8

Patient present with sloughing of the skin with erythematous rash and a fever caused by a S. aureus infection. The skin separation occurs at the level of the stratum granulosum. What is the most likely diagnosis?

Answer 8

Staphylococcal scalded skin syndrome

Question 9

What is the mechanism of skin loss seen with staphylococcal scalded skin syndrome?

Answer 9

The exfoliative A and B toxins of S. aureus results in epidermolysis of the stratum granulosum.

Question 10

How is staphylococcal scalded skin syndrome distinguished from toxic epidermal necrolysis?

Answer 10

Level of skin separation. With TEN the separation occurs at the dermal-epidermal junction and with staphylococcal scalded skin syndrome the separation occurs at the stratum granulosum

Question 11

What is the typical presentation of a verruca (wart)?

Answer 11

Fleshed-colored papule with a rough surface

Question 12

What is the cause of a verruca (wart)?

Answer 12

HPV infection of the keratinocytes

Question 13

What is the characteristic change that occurs to the keratinocytes with an HPV infection that causes a verruca (wart)?

Answer 13

Koilocytic change

Question 14

What are the 2 most common locations for verruca to occur?

Answer 14

Hands and feet

Question 15

A firm, pink umbilicated papule that is caused by the poxvirus…

Answer 15

Molluscum contagiosum