2. Skin, Soft Tissue, and Wound Infections Flashcards Preview

Clinical Microbiology 2 > 2. Skin, Soft Tissue, and Wound Infections > Flashcards

Flashcards in 2. Skin, Soft Tissue, and Wound Infections Deck (58):
1

Cause of swimmer's itch?

Parasitic skin infection by cercariae (burrows into skin)

2

Source of M. ulcerans

Tropical wetlands (swamps)

3

Necrotizing fasciitis agents

- S. pyogenes
- S. aureus
- Anaerobes

4

Pyoderma that may be caused by Aeromonas (fresh water) or Vibrio (sea water)

Cellulitis

5

Begin as painless papules which become hemorrhagic vesicles that may become necrotic

Anthrax

6

Causes syphilis

Treponema pallidum

7

5 uncommon bacterial infections of the skin

- Mycetoma
- Chromoblastomycosis
- Phaeohyphomycosis
- Mucormycosis
- Lobomycosis

8

Skin infection due to HSV I? HSV II?

I - cold sores
II - genital herpes

9

Osler nodes and Janeway lesions are indicative of ...?

Endocarditis

10

Fungal media should be added to all ________ specimens

burn

11

Erythrasma

- Brown, scaly skin patches
- Groin, inner thighs, armpits, toe webs
- Usually in men, obese, diabetics

Corynebacterium minutissimum

12

Pyoderma common caused by Grp A strep; S. aureus more rare

Erysipelas

13

usually a progression of untreated impetigo

infection penetrates the dermis; painful sores at first, then deeper ulcers form

ecthyma

14

Tinea versicolour

Diffuse distribution of hypopigmented macules

Malassezia furfur (yeast)

15

Intertrigo

Infectious dermatitis common in skin folds of infants and obese adults

Candida albicans

16

2 infections in which Wood's lamp is useful

Erythrasma - lesions fluoresce coral red

Dermatophyte infections - Microsporum fluoresces yellow-green

17

The only organisms that can grow using keratin

dermatophyte fungi

18

Treatment for this infection could be local hyperthermia (42-43 degC)

Sporotrichosis

19

"Swimming pool granuloma"

Mycobacterium marinum

20

Itraconazole (1st line drug) is for what infection?

Sporotrichosis

21

Pyoderma caused by Erysipelothrix rhusiopathiae

Erysipeloid

22

TSI is often used to screen for this infection (causes H2S+)

Erysipeloid

23

Difference between TSS and scalded skin syndrome effect on skin layers?

TSS = necrosis of FULL epidermal layer

SSS = only top layers shed

24

German measles AKA ______ is caused by ________

rubella

Rubivirus

25

Viral infection that is caused by HPV

Warts

26

2 animal bite related organisms that show the same plate growth and only differ in 1 chemical test.
Which 2 organisms and which test?

Pasteurella multocida, Bergeyella zoohelcum

Urea (P. multocida is NEG)

27

Myonecrosis agents

AKA gas gangrene when caused by C. perfringens, other Clostridium

Also:
Anaerobic strrep, Enterobacteriaceae

28

Sulphur granules discharge is common in this infection

Actinomycosis

29

Causative agent in non-bullous impetigo? Bullous imepetigo?

Non-bullous - Grp A strep

Bullous - S. aureus

30

English measles AKA __________ is caused by ________

rubeola

Morbillivirus

31

Treatment for uncommon bacterial skin infections?

Surgical debridement

32

Small painful nodules on pads of fingers and toes due to immune complexes deposited in soft tissue

Osler nodes

33

How to differentiate S. intermedius from S. aureus?

S. intermedius is PYR+

34

4 types of infectious dermatitis

Intertrigo
Erythrasma
Dermatophytosis
Tinea versicolour

35

Myositis agents

S. aureus, almost anything

36

Uncommon bacterial skin infection that possibly involves bone

Mycetoma

37

Toxin that causes scarlet fever? Causative agent?

Erythrogenic toxin. GAS.

38

Acid-fast stains and culture are required for these infections

Mycobacterial infections

39

Skin manifestation caused by S. aureus exfoliative toxins (pyrogenic)

Scalded skin syndrome

40

Transmitted by body lice (organism + infection)

Bartonella quintana
Trench fever

41

Term used to denote a dermatophyte infection

tinea

42

Infection of nail cuticle

Paronychia

43

Special media set up for this type of infection includes: PDA, Mycosel, IMA, SAB, 10% KOH direct exam

Dermatophyte

44

Impetigo

- Itchy - scratching spreads it
- Disease of childhood
Schools, daycares (crowded conditions)

GAS (non-bullous)
S. aureus (bullous)

45

Borrelia burgdoferi

Lyme disease

bull's eye lesion

46

Small hemorrhagic spots that don't blanch; usually caused by bacterial infections

Petechiae

47

Bartonella henselae culture requirements and s/?

CHOC, BAP high humidity and CO2 helpful

gnb, occasionally curved

48

- Tricophyton
- Microsporum
- Epidermophyton

can all cause?

Dermatophytosis

49

SXT (choice) also Imipenem, amikacin may be used to treat?

Nocardiosis

50

2 Mycobacterium where the source can be soil

M. foruitum

M. chelonae

51

Animal bite related, long fusiform gnb that exhibits gliding motility

Capnocytophaga canimorsus

52

Painless hemorrhagic macules on palms and soles

Janeway lesions

53

Specimens required for dermatophyte infection?

Dry skin scraping
Hair or nail clippings

54

Purpose of KOH in wet prep direct microscope examination of skin scrapings

Clears tissues => easier to see fungal elements

55

Specimens collected for Bartonella henselae infection?

Lesion biopsies, blood cultures

56

Ecthyma gangrenosum (EG) is associated with what bacteria?

Pseudomonas

Also S. aureus, Candida

57

Antifungal amphotericin B is used to treat..?

Mucormycosis

58

Streptobacullus moniliformis is the causative agent of?

Rat bites