bacterial and fungal infection of the skin Flashcards Preview

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Flashcards in bacterial and fungal infection of the skin Deck (39)
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1
Q

(+) coagulase; (+) catalase tests; beta hemolysis

A

S. aureus

2
Q

gram + cocci in clusters; most pathogenic

has protein A

A

S. aureus

3
Q

common area of colonization of S. aureus

A

nasopharyngeal mucosa

4
Q

3 common clinical manifestations of S. aureus infection

A

Folliculitis
Furuncle
Carbuncle

5
Q

Superficial inflammation of the hair follicle; small erythematous papules/pustules associated with follicles

A

Folliculitis

6
Q

common name boil; painful lump with pus

deeper form of folliculitis; associated with pain

A

Furuncle

7
Q

formed when furuncles coalesce; found in thick skin; seen in diabetic patients

A

carbuncle

8
Q

also called as acne inversa; disorder of the apocrine gland; common location axilla, mammary and perianal regions.

A

Hiradenitis suppurativa

9
Q

yellowish crust on the skin

A

impetigo

10
Q

also called as Ritter’s disease or pemphigus neonatorum

A

Staphylococcal Scalded Skin Syndrome

11
Q

most aggressive form of S. infection; production of exfolatin by bacteria causes infection

A

Staphylococcal Scalded Skin Syndrome or Ritter’s disease

12
Q

S. aureus grows in ________

A

BAP; MSA

13
Q

biochemical tests for S. aureus

A

coagulase and catalase (+)

14
Q

treatment of S. aureus skin infection

A

wound cleaning and surgical drainage; Penicillin

if MRSA, vancomycin

15
Q

common cause of Sore throat; gram positive cocci in pairs; strict parasite; sensitive to bactracin; beta hemolytic

A

Streptococcus pyogenes

16
Q

Common reservior of S. pyogenes in humans

A

nasopharyngeal

17
Q

mode of transmission of S. pyogenes

A

Droplet/ Direct

18
Q

enhance transmission of strep infection

A

overcrowding, warm climate

19
Q

non infectious sequelae of Strep infection

A

Rheumatic heart disease and acute glomerulonephritis

20
Q

Typical secondary infection in a child with atopic dermatitis

A

impetigo contagiosa

21
Q

main character of impetigo, strep infection

A

yellow crusting

22
Q

infection of the epidermis which extends to the dermis with characteristic punched out lesions

A

ecthyma

23
Q

strep caused deep seated infection of the subcutaneous dermis an emergency case with violaceous discoloration of the skin

A

necrotizing fascitis

24
Q

laboratory diagnosis of strep

A

G (+) cocci in pairs
BAP; b-hemolysis
(+) bacitracin
latex agglutination (Ig monoclonal to C-carbohydrate)

25
Q

treatment of strep infection

A

penicillin ; alternative; macrolides, eryhromycin

26
Q

gram negative aerobic bacilli; oppurtunistic pathogen which secretes pyocyanin, pyoverdin, pyorubin

A

pseudomonas aeruginosa

27
Q

biochemical test for P. aeruginosa

A

oxidase test positive

28
Q

definitive diagnosis of p. aeruginosa

A

production of pyocyanin and fluorescein

29
Q

clinical manifestations of P. aeruginosa

A
green nail syndrome 
secondary wound infection 
hot tub folliculitis 
burn wound sepsis 
ecthyma gangrenosum
30
Q

paronchychial infection that develop in individuals whose hands are infrequently submerged in water

A

green nail syndrome

31
Q

occur in patients with decubitus ulcer, eczema and tinea pedis

A

secondary wound infection

32
Q

pruritic follicular, maculopapular, vesicular or pustular lesions on any part of the body that was immersed in water

A

hot tub folliculitis

33
Q

pseudomonal bacteremia produces well-recognized but uncommon distinctive skin lesions

A

ecthyma gangrenosum

34
Q

classic disease associated with Corynebacterium diphtheriae

A

Diphtheria

35
Q

Mybacterium marinum

A

Fish tank granuloma

36
Q

M. chenolae

A

skin abscess

37
Q

caused by a closely related group of fungi which have the ablity to utilize keratin as nutrient source

A

dermatophytoses

38
Q

an anthropophilic fungus and is the most common and widely distributed dermatophyte of humans

A

trichophyton rubrum

39
Q

Key features of T. rubrum

A

culture characteristics, microscopic morphology and failure to perforate hair in vitro