bacterial skin infections normal flora of skin gm + cocci staphylococcus micrococcus gm + rods ...
TRANSCRIPT
![Page 1: BACTERIAL SKIN INFECTIONS NORMAL FLORA OF SKIN Gm + COCCI STAPHYLOCOCCUS MICROCOCCUS Gm + RODS PROPIONIBACTIRIUM CORYNEBACTIRIUM Gm –VE RODS](https://reader030.vdocument.in/reader030/viewer/2022012910/56649da25503460f94a8e74c/html5/thumbnails/1.jpg)
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BACTERIAL SKIN INFECTIONS
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NORMAL FLORA OF SKIN
• Gm + COCCI STAPHYLOCOCCUS MICROCOCCUS
• Gm + RODS PROPIONIBACTIRIUM CORYNEBACTIRIUM
• Gm –VE RODS ACINETOBACTER
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ROLE OF NORMAL FLORA
DEFENCE AGAINST BACTERIAL INFECTION
THROUGH BACTERIAL INTERFERENCE
PRODUCTION OF FREE FATTY ACIDS(FFA) FROM
SKIN LIPIDS
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STAPHYLOCOCCUS AUREUS
ANTERIOR NARES 35 %
PERIANAL SKIN 20 %
AXILLARY SKIN 5-10 %
TOE WEBS 5-10 %
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REDUCTION OF CARRIAGE
MUPIROCINE OINTMENT INTRANASALLY FOR 5 DAYS
ORAL RIFAMPICIN 600mg 7-10 DAYS
CLINDAMYCIN 150mg/day FOR 3 MONTHS
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STAPHYLOCOCCUS DISEASES
ImpetigoEcthymaScalded skin syndromeFurunculosisFolliculitisCarbuncleSycosis
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STREPTOCOCCUS DISEASES
ImpetigoEcthymaErysipelasCellulitisScarlet feverIntertrigo
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IMPETIGO
CONTAGIOUS SUPERFICIAL INFECTION OF THE SKIN
ORGANISIMS: STAPHYLOCOCCUS AUREUS,
STREPTOCOCCUS
PEAK SEASON: LATE SUMMER
AGE: PRESCHOOL & YOUNG SCHOOL AGE
EXISTING SKIN DISEASE: SCABIES, PEDICULOSIS
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CLINICAL FEATURES
VESICLE ON ERYTHEMATOUS BASE
RUPTURES - SERUM EXUDES
YELLOWISH BROWN CRUST
PERIPHERAL EXTENSION
HEALS WITHOUT SCARRING
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TREATMENT
TOPICAL ANTIBIOTICS
NEOMYCIN
BACITRACIN
FUCIDIC ACID
MUPIROCIN
SYSTEMIC ANTIBIOTICS
IF WIDESPREAD OR SEVERE
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ECTHYMA
PYOGENIC INFECTION OF THE SKIN CHERACTERISED BY FORMATION OFCRUST BENEATH WHICH ULCERATIONOCCURS
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AETIOLOGY
STAPH. AUREUS, STREPTOCOCCUS
POOR HYGIENE
MALNUTRITION
OTHER PREDISPOSING FACTORS
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CLINICAL FEATURES
BULLAE OR PUSTULE
HARD CRUST
PURULENT IRREGULAR ULCER
HEALS WITH SCARRING
BUTTOCKS, THIGHS AND LEGS
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TREATMENT
SAME AS FOR IMPETIGO
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INFECTIONS INVOLVING HAIR FOLLICLES
FOLLICULITIS
FURUNCLE
CARBUNCLE
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FOLLICULITIS
INFLAMMATORY CONDITION OF THE HAIR FOLLICLE WITH CHANGES CONFINED TO OSTIUM
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AETIOLOGY
BACTERIAL: STAPHYLOCOCCAL
FUNGAL: TRICHOPHYTON RUBRUM
CHEMICAL: TAR
DRUGS: STEROIDS
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CLINICAL FEATURES
SMALL FOLLICULAR PAPULE OR PUSTULE
RARELY PAINFUL
HEALS WITHOUT SCAR
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TREATMENT
REMOVE UNDERLYING CAUSE
TOPICAL ANTISEPTICS
TOPICAL ANTIBIOTICS
SYSTEMIC ANTIBIOTICS
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FURUNCLE
ACUTE USUALLY NECROTIC AND DEEP SEATED INFECTION OF HAIR FOLLICLE
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AETIOLOGY
STAPH. AUREUS
SEBORRHOEIC / ATOPIC INDIVIDUALS
DIABETICS
SCABIES
HIV
MALNUTRITION
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CLINICAL FEATURES
SMALL FOLLICULAR NODULE
TENDER
LOCALIZED NECROSIS
HEALS WITH SCARRING
FEVER & MILD CONSTITUTIONAL SYMPTOMS
CAVERNOUS SINUS THROMBOSIS
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TREATMENT
GENERAL MEASURES
SYSTEMIC ANTIBIOTICS
TOPICAL ANTIBIOTICS
ANALGESICS
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CARBUNCLE
DEEP SEATED INFECTION OF A GROUP OF CONTIGUOUS HAIR FOLLICLES
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AETIOLOGY
STAPH. AUREUS
MIDDLE AGED MEN
DIABETES, MALNUTRITION
CARDIAC FAILURE
DRUG ADDICTS
PROLONGED STEROIDS
ERYTHRODERMA
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CLINICAL FEATURES
HARD RED PAINFUL NODULE
MULTIPLE DISCHARGING FOLLICULAR SINUSES
NECROSIS OF INTERVENING SKIN
DEEP ULCER WITH PURULENT FLOOR
BACK OF NECK, SHOULDERS, HIPS, THIGH
FEVER
SEPTICAEMIA
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TREATMENT
SYSTEMIC ANTIBIOTICS
TOPICAL ANTIBIOTICS
ANTIPYRETICS/ ANALGESICS
SURGICAL INTERVENTION WHEN INDICATED
REMOVAL OF UNDERLYING CAUSE
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CELLULITIS
ACUTE, SUBACUTE OR CHRONIC INFECTION OF LOOSE CONNECTIVE TISSUE PERTICULARLY SUBCUTIS
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AETIOLOGY
STREPTOCOCCI
H. INFLUENZA
STAPH. AUREUS
PSEUDOMONAS
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CLINICAL FEATURES
ERYTHEMA
SWELLING
HOT & TENDER
ILL-DEFINED MARGINS
CONSTITUTIONAL SYMPTOMS
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COMPLICATIONS
FASCIITIS
MYOSITIS
GANGRENE
SUBCUTANEOUS ABSCESSES
SEPTICAEMIA
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TREATMENT
APPROPRIATE ANTIBIOTICS
ANALGESICS
REST
TREATMENT OF COMPLICATIONS
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ERYSIPELAS
EDGES WELL DEMARCATED, RAISED
BLISTERING COMMON
MORE SUPERFICIAL INVOLVEMENT
FACE COMMON SITE
RESPONSE TO TREATMENT RAPID
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Common skin condition affecting the skin folds such as under the arms, in the groin and between the toes.
Erythrasma does not usually cause any symptoms.
It presents as a slowly enlarging patches of pink or brown dry skin.
Caused by Corynebacterium minutissimum.
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Diagnosis confirmed by Wood’s lamp examintation which turns erythrasma to fluoresce a coral-pink colour.
Erythrasma can be treated with antiseptic and topical antibiotic such as: • fusidic acid cream • Clindamycin solution.•Erythromycin lotion.
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VIRAL INFECTIONS OF SKIN
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VIRAL WARTS
HUMAN PAPILLOMA VIRUS
DNA – VIRUS 50-55nm
77 DIFFERENT TYPES
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CONT’D
INFECT SQUAMOUS EPITHELIA
CAUSE CELL PROLIFERATION -- PAPILLOMA
DYSPLASIA / NEOPLASIA
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TYPES
Common warts
Plane warts
Filiform warts
Plantar warts
Acuminate warts
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COMMON WARTS HPV - 2
FIRM PAPULES / PLAQUES
ROUGH HORNY SURFACE
SYMPTOMLESS
SITES - BACK OF HANDS, FINGERS,
ANYWHERE ON SKIN
65% DISAPPEAR IN 2 Yrs
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PLANE WARTS
HPV 3, 10
SMOOTH, FLAT OR SLIGHTLY ELEVATED
1- 5 mm ROUND OR POLYGONAL
FACE AND BACK OF HANDS
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FILIFORM WARTS
FINGER-LIKE PROJECTIONS
FACE, NECK AND SCALP
COMMONLY IN MALES
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PLANTAR WARTS
HPV 1, 2, 4, 57
SMALL SHINING SAGO GRAIN LIKE PAPULE
USUALLY PAINFUL HYPERKERATOTIC
PRESSURE AREAS OF SOLE, PALMS
MOSAIC PATTERN
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ACUMINATE WARTS
HPV- 6, 11, 16 ; VENERIALLY ACQUIRED
MUCO-CUTANEOUS JUNCTIONS AND INTERTRIGINOUS
AREAS
SOFT, PINK , MOIST SURFACE
PEDUNCULATED OR CAULIFLOWER LIKE
MACERATION - INFECTION, MALODOUR
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DIAGNOSIS
HISTOLOGY
ELECTRON MICROSCOPY
IMMUNOHISTOCHEMISTRY (TYPE
SPECIFIC ANTIBODIES)
PCR
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SPONTANEOUS RESOLUTION
GENERAL MEASURES
TREATMENT
AVOIDANCE OF SHARED TOWELS AND SHOES
AVOID BITING NAILS
ADEQUATE PLASTIC STRAPPING AT SWIMMING POOL
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DESTRUCTIVE MODALITIES
Electrocautery
Cryotherapy
Salicylic acid
Podophyllin
Surgical methods
CO2 Laser
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Other modalities
Cimetidine
Retinoids
Interferon
Imiquimod
Antiviral therapy (cidofovir)
Intralesional bleomycin
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MOLLUSCUM CONTAGIOSUM
Caused by MCV-1, MCV-2
Mainly in children
Direct contact
Discrete shiny, pearly white, rounded papules
Umbilicated centers
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TREATMENT
General measures
Topical Retinoids
Puncture with wooden probe dipped in tincture
iodine
Cryotherapy
Electrocautery
CO2 Laser
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HERPES SIMPLEX
Herpes virus hominis
Type 1, 2
Persist in sensory nerve ganglia
Spread: Direct contact, droplets
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CLINICAL FEATURES
Sub-clinical
Age 1-5 years
Incubation period 5 days
Fever, malaise, dribbling of saliva
Gums - swollen, inflamed
Primary infection
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Cont’d
Vesicles, ulcers
Tongue, pharynx, palate, buccal mucosa
Regional lymph nodes – enlarged & tender
Recovery in 2 weeks
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Cont’d
Herpes genitalis
Kerato-cunjunctivitis
Inoculation herpes simplex
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Recurrent infection
50% type 1, 95% type 2
Smaller vesicles
Close grouping
No constitutional symptoms
Buccal mucosa not affected
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TRIGGERING FACTORS
Minor trauma
Febrile illnesses
UV radiation
Dental surgery
Pre-menstrual period
Emotional stress
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COMPLICATIONS
Cranial Nerve palsies e.g. Bell's palsy
Eczema herpeticum
Erythema multiforme
Encephalitis
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TREATMENT
Mild, uncomplicated : no treatment or topical
antiseptic
Severe primary infection : antiviral therapy
(Acyclovir 200mg 5 times/day)
Recurrent : topical antiviral
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CHICKEN POX
HERPES VIRUS VARICELLAE
DROPLET INFECTION
2 -10 YEARS
INCUBATION PERIOD : 14-17 DAYS
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CLINICAL FEATURES
FEVER, MALAISE, RASH
MORBILIFORM ERYTHEMA
PAPULES, VESICLES
PUSTULES WITH RED AREOLA
DRY CRUST, PINK DEPRESSION
HEALS WITHOUT SCARRING
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Sign (dewdrop on a rose petal)
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Papules & vesicles
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Polymorphic lesions
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Chickenpox & bullous impetigo
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Large pustules & umbilicated lesions
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COMPLICATIONS
SECONDRY INFECTION
ENCEPHALITIS
HEPATITIS
PNEUMONIA
ARTHRITIS
SEPTICAEMIA
STEVENS - JOHNSON SYNDROME
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TREATMENT
REST
ANALGESICS
SOOTHING ANTISEPTICS
DAILY BATHING
ANTIBIOTICS FOR SECONDARY BACTERIAL
INFECTION
ANTIVIRAL THERAPY
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HERPES ZOSTER(SHINGLES)
HERPES VIRUS VARICELLAE
INCIDENCE INCREASES WITH AGE
PATIENTS ARE INFECTIOUS
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CLINICAL FEATURES
FIRST MENIFESTATION – SEVERE PAIN
HEADACHE, MALAISE, LOCALISED
TENDERNESS
GROUPED RED PAPULES IN DERMATOMAL
PATTERN
VESICLES, PUSTULES
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Cont’d
MUCOUS MEMBRANE INVOLVEMENT
LYMPHADENOPATHY
RECOVERY 2-4 WEEKS
OCCASIONALLY PAIN NOT FOLLOWED BY ERUPTION
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Cont’d
THORACIC - 53%
CERVICAL - 20%
TRIGEMINAL - 15%
LUMBOSACRAL - 11%
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Disseminated lesions
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COMPLICATIONS
FACIAL PALSY
SENSORY LOSS
MENINGOENCEPHALITIS
POST HERPETIC NEURALGIA (PHN)
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TREATMENT
BED REST
ANALGESICS
LOCAL ANTISEPTICS
TOPICAL ANTIBIOTICS
ANTIVIRAL THERAPY
TREATMENT OF PHN
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