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PARASITIC INFECTIONS
• Scabies• Pediculosis• Leishmaniasis• Larva migrans• Trichomoniasis• Myiasis
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SCABIES
Sarcoptes scabiei ‐var.hominis
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Life cycle
Life span 4‐6 weeks
40 ‐ 50 eggs in life
Adult female eggs Six legged larva
3‐4 days
Copulation adult nymph
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Incubation
2 – 3 months ‐ first exposure
1day ‐1 month ‐ re‐exposure
Pathology
Delayed hypersensitivity (mite antigen)
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Mode of infestation
Close intimate contact
(Skin to skin)
Pregnant female ‐ nymph
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Clinical featuresGeneralized pruritus (night)
Skin lesions ‐ burrow
Hands
Abdomen,
Male genitalia,
Female breast
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Burrow - characteristic lesion
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Papules,Vesiculo-pustulesCrustExcoriationsSecondary pyoderma Family history
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ComplicationsSecondary infectionGlomerulonephritis
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Nodular scabies
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Diagnosis Clinical features
Demonstration of MiteOva,Nymph Faecal pellets
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TREATMENT
1. Permethrin 5% lotion/cream ‐ once2. Gamma‐benzene hexachloride 1%3. Benzyl benzoate lotion (25%)‐3 applic4. Crotamiton 1% ‐ twice daily x 2 weeks5. Ivermectin – 12mg, single oral dose
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• Symptomatic ‐ Antipruritic• Sec infection ‐ Antibiotics• Eczematization ‐ Steroids• Treat Contacts ‐ both
symptomatic/ asymptomatic
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NORWEGIAN SCABIES
(Crusted scabies)
Immunocompromised
Diabetic
Leukemia
Lymphomas
Mental illnesses
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Specific Features
no pruritus (Slight)
• Mites – Millions
• Sources – for large outbreaks
• Treatment – same as scabies‐ repeat
Methotrexate
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Animal scabies (mange)
Cat, dog
No burrows
Self limiting
Treat animal
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PEDICULOSIS
•Pediculus humanus
var.Capitis – P.capitis
var.Corporis – P.corporis
•Phthirus pubis – Pediculosis pubis
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Life cycle
Life span 40 Days
300 eggs in life : 7 ‐10 eggs / day
Adult female eggs(nits) in 7days
Copulation adult (1month) nymph
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Pediculosis capitis
Pediculus humanus var. capitis
‐ Close intimate contact
‐ Combs, bed,
unhygienic living
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Clinical features
Scalp pruritus
Scalp pyoderma
Suboccipital
Cervical L.N.
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DiagnosisMite ‐ adult, nymph, eggs
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Treatment
• Permethrin 1%
• GBHC 1%
• 25% Benzyl benzoate
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Pediculosis corporis(Vagabond’s disease)
Pediculus humanus var. corporisMorphologically same – white/grey
Generalised pruritusExcoriationsSecondary infection
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•Seams of clothes
Sharing clothes
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DiagnosisDemonstration of mite/nymph/egg
Treatment•Disinfect clothes
•Wash – steam Iron
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Pediculosis pubis(Phthirus pubis)
• Sexually transmitted disease
• Generalized pruritus
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•Site - pubic hair- axillary hair- umbilicus- eyebrows- eyelashes
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Diagnosis
•Lice – adult, eggs, nymph
Treatment
Same as Pediculosis capitisTreat sexual partner(s)
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Larva migrans(Creeping eruption)
Cutaneous larva migrans
Ankylostoma brazalienseGnathosterma spinigerum
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Strongyloides stercoralisLarva currens
DermatitisWavyStreaky
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Treatment Thiabendazole under occlusionAlbendazoleExcision
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MYIASIS (Maggot infestation)Primary
FuruncularSubcutaneous migratory
SecondaryWound myiasis
DipteraHypoderma
GastrophilusOestrusDermatobisMusca
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Treatment
• Turpentine oil
• Manual extraction
• Exploration
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LeishmaniasisVisceral (Kala‐azar)
Cutaneous
Oriental sore (Delhi boil)
L.tropica
L. major
L.aethiopica
Vector – Sandfly (Phlebotomus)
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Clinical features
I.P. – 2 months
Small nodule
Ulcer 2‐3 months
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Diagnosis Biopsy – granulomaL‐D bodies
TreatmentAntimony compounds (Sodium stibogluconate 10mg/kg x3‐4 timesKetoconazoleItraconazole
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Thank you