Infection Flashcards

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1
Q

What is pityriasis rosea

A

post viral skin condition
solitary lesion known as a herald patch appears first and then there is truncal eruption of small pink oval lesions
each lesion has peripheral scale
Xmas tree distribution

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2
Q

management of pityriasis rosea

A

self limiting
topical steroids
phototherapy rarely if severe

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3
Q

What is pityriasis versicolor

A

yeast infection of the skin which can result in hyper/hypopigmented patched

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4
Q

what microbes affect the skin

A

bacterial - staph A, strep pyogenes, pseudomonas
viral - HSV, VZV, Orf
fungal - dermatophyte: trichophytum rubrum
yeast - malassezia, candida

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5
Q

what is folliculitis

A

inflammation of the hair follicles

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6
Q

what is furunculosis

A

acute deep infection of the hair follicles

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7
Q

what do you call infection of a single hair follicle

A

boil

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8
Q

what is a carbuncle

A

contiguous hair follicles that have become infected - multiple heads

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9
Q

cause of impetigo

A

Staph Aureus

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10
Q

what can cause folliculitis

A

Staph aureus

Malassezia yeast

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11
Q

features of impetigo

A

yellow coloured / honey crust
raw bright red appearance underneath
usually on the face and affects young children

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12
Q

cause of Bullous impetigo

A

Staph A exotoxin resulting in desquamation

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13
Q

what is SSSS

A

widespread Staph A infection resulting in lots of desquamation
children > adults

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14
Q

causes of cellulitis

A

staph aureus

strep pyogenes

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15
Q

what do you call infection of the dermis

A

cellulitis

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16
Q

features of cellulitis

A

unilateral hot tender advancing rash on lower limbs
signs of infection
absence of scale…

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17
Q

what is erysipelas

A

more superficial infection of the skin

peau d’orange and swollen appearance

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18
Q

what do you call infection of the subcutis and what is the management

A

nectrostising fasciitis

debridement and IV antibiotics

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19
Q

investigations for bacterial infection

A

swabs and sensitivities

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20
Q

Management of bacterial infection

A

topical fusidic acid / mupirocin
oral antibiotics
prevention of spread
IV antibiotics

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21
Q

Cause of viral warts

A

HPV 1-4

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22
Q

RF for viral infections

A

immunocompromised - HIV, steroids, biologics, genetics

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23
Q

cryotherapy is a good treatment option for peri ungal warts, true or flase

A

false, it can cause permanent damage to nail growth

salicylic acid is used instead

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24
Q

You must treat all viral warts, true or false

A

false, they are self limiting

but they are usually treated anyway

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25
Q

describe molluscum contagiosum

A

small umbilicated firm papules

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26
Q

cause of molluscum contagiosum

A

pox virus

27
Q

what is herpes labialis also known as

A

cold sores

28
Q

management of herpes labialis

A

self limiting or prophylactic aciclovir

29
Q

HSV of skin appearance

A

clustered vesicles

30
Q

cause of shingles

A

VZV

31
Q

clusters of vesicles differential diagnoses

A

HSV and VZV

viral swab to differentiate

32
Q

features of eczema herpeticum

A
monomorphic punched out lesions 
widespread 
painful 
erythematous erosions 
excoriations
33
Q

pattern of shingles

A

vesicles in a dermatomal pattern

may burst to form erosions

34
Q

what is tinea pedis also known as

A

athletes foot

35
Q

conditions that favour fungal infection

A

macerated / wet

36
Q

what is tinea cruris

A

fungal infection of the groin

37
Q

what is tinea manuum

A

fungal infection of the hand

38
Q

how can the configuration of fungal infections be described

A

annular - ring shaped

39
Q

causes of fungal infection

A

dermatophyte

40
Q

management of fungal infection

A

topical antifungals

oral terbinafine

41
Q

what happens when a fungal infection is maltreated with steroids

A

tinea incognita
loses annular appearance
diffuse red rash
harder to diagnose as fungal

42
Q

what is tinea unguum and how do you manage it

A

nail fungal infection
PO therapy - be aware of side effects e.g.
hepatotoxic
interactions

43
Q

what is tinea corporis

A

fungal infection of the body

44
Q

what is tinea capitus

A

fungal infection on the head/scalp

45
Q

what is a kerion and in whom is it seen

A

severe inflammatory reaction to tinea capitus in the scalp - can lead to scarring hair loss
boggy indurated lesion with pus
children
needs oral therapy

46
Q

fungal infection investigations

A

scrapings
clippings of hair and nails
Woods lamp
Biopsy with PAS stain (not usually done)

47
Q

management of fungal infection

A

anti yeast cream
ketoconaole
shampoo

48
Q

what infections can candida cause

A

angular cheilitis
intertrigo - raindrop appearance
white discolouration

49
Q

what is paronychia and what are the divisions

A

infection/inflammation around the nail bed

acute and chronic

50
Q

causes of paronychia

A

bacterial

fungal

51
Q

features and cause of acute paronychia

A

rapid onset
collection of cysts
usually bacterial - staph or pseudomonas

52
Q

cause of chronic paronychia

A

yeast

clippings

53
Q

management of fungal infections

A

topical antifungals
PO for scalp or nails
be aware of hepatotoxicity with oral therapy

54
Q

in which condition is a Tzanck smear done

A

SSSS

55
Q

risk factors for cellulitis

A
immunocompromised 
DM 
CKD
Ulcers 
Obesity 
alcohol 
bites 
athletes foot
56
Q

which strains of HPV cause the following:
hand and feet warts
genital warts
cervical cancer

A

hand and feet warts - HPV 1-4
genital warts - HPV 6, 11
cervical cancer - HPV 16+18

57
Q

in which direction do fungal infections grow

A

outwards and heals in the centre

so always take scrapings from the edge

58
Q

features of scabies infection

A

persistent itching - worse at night
close contacts also itching
tracts in webspaces
black dots

59
Q

management of scabies infection

A

topical permethrin for patients and family

60
Q

what complication must you check for in herpes zoster ophthalmicus

A

Hutchinsons sign - rash at the tip of the nose is suggestive of involvement of the cornea

61
Q

appearance of erythema multiforme and causes

A

targetoid lesions

HSV, mycoplasma pneumoniae

62
Q

what is treponema pallidum also known as

A

syphilis

63
Q

in which condition is erythema chronicum migrans seen in

A

lyme disease