Deck 33: Skin and Soft Tissue Infections

Question 1

What causes scarlet fever?

A) S. aureus
B) Endotoxin
C) Proteases
D) Erythrogenic toxin

Answer 1

D
Scarlet fever is a characteristic form of group A streptococcal disease that occurs when the infecting strain produces a scarlatiniform or erythrogenic toxin.

Question 2

What organism causes the Buruli ulcer?

A) Streptococcus agalactiae
B) Mycobacterium ulcerans
C) Corynebacterium jejuni
D) Mycobacterium leprae

Answer 2

B
M.ulcerans infection usually occurs as a single,painless ulcer with undermined edges (the so-called Buruli ulcer of the tropics).

Question 3

A group of swim team members break out in a rash (folliculitis)the day after swimming at the pool.What organism is probably responsible for this outbreak?

A) Staphylococcus aureus
B) Enterococcus
C) Escherichia coli
D) Pseudomonas aeruginosa

Answer 3

D
Folliculitis is an inflammation and infection of hair follicles.S.aureus is the most common etiologic agent of folliculitis,although P.aeruginosa has been implicated in cases acquired from contaminated swimming pools or whirlpools.

Question 4

Which of these is an abscess that extends more deeply into the subcutaneous fat and may have multiple draining sites?

A) Furuncle
B) Carbuncle
C) Folliculitis
D) Impetigo

Question 5

What is a form of folliculitis in bearded men?

A) Sycosis barbae
B) Furuncle
C) Carbuncle
D) Impetigo

Question 6

Besides antimicrobial therapy,how are most carbuncles treated?

A) Teabags to draw the poison out
B) Moist heat, then cold compresses
C) Surgical drainage
D) Squeezing to express the pus and necrotic tissues

Question 7

Lesions from which bacteria fluoresce coral red when examined under a Wood's lamp?

A) Corynebacterium minutissimum
B) Staphylococcus aureus
C) Clostridium tetani
D) C. difficile

Question 8

What is the most infamous type of myonecrosis?

A) Tetanus
B) Flesh-eating Streptococcus
C) Gas gangrene
D) Ebola hemorrhage

Question 9

Erythematous macules,petechiae,and purpura are all skin lesions of what condition?

A) Hepatitis
B) Meningococcemia
C) Encephalitis
D) Salmonella

Question 10

What is erysipelas?

A) Inflammation of hair follicle
B) A deep form of cellulitis
C) A synonym for furuncle
D) A synonym for carbuncle

Question 11

What organism is known to cause severe necrotic cellulitis and primary sepsis?

A) Vibrio vulnificus
B) V. parahaemolyticus
C) Campylobacter spp.
D) Staphylococcus aureus

Question 12

What is the most common bacterium found on the skin?

A) Coagulase-negative staphylococci
B) Coagulase-negative streptococci
C) Escherichia coli
D) Pseudomonas aeruginosa

Question 13

What condition causes the nail margin to become painful,red,warm,and swollen with pus?

A) Furuncle
B) Carbuncle
C) Erysipelas
D) Paronychia

Question 14

What organism,which usually causes respiratory infections,causes maculopapular and vesicular rashes,urticaria,and immunologically mediated erythema nodosum and erythema multiform?

A) Streptococcus pneumoniae
B) Klebsiella pneumoniae
C) Mycoplasma pneumoniae
D) Haemophilus influenzae

Question 15

What happens in the late stages of toxic shock syndrome as a result of the production of exotoxin F?

A) Bruising
B) Disseminated intravascular coagulation (DIC)
C) Desquamation
D) Bacteremia

Question 16

What is the most sensitive method of diagnosing cutaneous infections?

A) Culture
B) Enzyme immunoassay (EIA)
C) Polymerase chain reaction (PCR)
D) DNA probe

Question 17

What condition presents as a localized area of mildly painful erythema,warmth,and swelling of the skin with poorly demarcated margins?

A) Impetigo
B) Carbuncles
C) Furuncles
D) Cellulitis

Question 18

What organism is most often responsible for impetigo?

A) Staphylococcus epidermidis
B) Streptococcus pyogenes
C) Enterococcus faecalis
D) Streptococcus agalactiae

Question 19

The clinical syndrome of Rocky Mountain spotted fever can be confused with which of the following conditions?

A) Lyme disease
B) Atypical measles
C) Syphilis
D) Allergic reactions

Question 20

What organism produces "ratbite fever"?

A) Streptobacillus moniliformis
B) Staphylococcus aureus
C) Borrelia burgdorferi
D) Chlamydia trachomatis

Question 21

What causes rubella?

A) Calicivirus
B) Herpesvirus
C) Paramyxovirus
D) Togaviridae

Question 22

What disease results from a reactivation of the varicella-zoster virus that demonstrates a vesicular eruption in a unilateral dermatomal distribution?

A) Shingles
B) Chicken pox
C) Infectious mononucleosis
D) Rubella

Question 23

What is herpetic whitlow?

A) Primary herpetic lesions of the genitals
B) Primary herpetic lesions of the finger
C) Primary herpetic lesions of the anus
D) Primary herpetic lesions of the lip

Question 24

What causes erythema infectiosum?

A) Parvovirus
B) Herpesvirus
C) Paramyxovirus
D) Togaviridae

Question 25

What is swimmer's itch?

A) When cercariae larvae penetrate human skin, causing dermatitis
B) When arthropods deposit larvae in human skin, causing dermatitis
C) When food or water causes a dermatitis
D) When Pseudomonas spp. causes a dermatitis

Question 26

All of the following viruses cause a characteristic viral syndrome and severe bleeding manifestations EXCEPT:

A) Ebola
B) Rabies
C) Junin
D) Marburg

Question 27

What is thrush?

A) Tinea unguium
B) Tinea corporis
C) Dermatophytosis
D) Oral candidiasis

Question 28

What causes rubeola?

A) Calicivirus
B) Herpesvirus
C) Paramyxovirus
D) Torovirus

Question 29

What is a circumscribed,hyperkeratotic,rough-textured,painless papule called?

A) Skin tick
B) Mole
C) Freckle
D) Wart

Question 30

What is river blindness?

A) Infection with Naegleria fowleri
B) Infection with Onchocerca volvulus
C) Infection with Strongyloides stercoralis
D) Infection with Entamoeba histolytica

Question 31

What is ringworm?

A) A parasitic skin infection
B) A bacterial skin infection
C) A fungal skin infection
D) A viral skin infection