Viral infections Prof Hamza Abdel-Raou… · Viral infections of the skin By Hamza Abdel-Raouf...
Transcript of Viral infections Prof Hamza Abdel-Raou… · Viral infections of the skin By Hamza Abdel-Raouf...
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Viral infections of the skin
By
Hamza Abdel-Raouf
Professor of Dermatology,
Minia University, Minia - Egypt
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Viral Skin infections
1- Herpes Simplex virus
2- Varicella Zoster virus
3- Warts
4- Molluscum Contagiosum
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Common Criteria of Herpetic infections
1- clinical recovery
2- no viral eradication
3- dormant
4- reactivation
5- 2ry attack
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Herpes Simplex
Aetiology
Type 1 (HSV-1): non genital infections
Type- 2 (HSV-2): genital infections
Incubation peroid
2 - 5 days
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Mode of infection
1- droplet infection
2- direct contact
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Primary attack of Herpes Simplex
1- no previous infection
2- no neutralizing antibodies
3- usually subclinical
4- constitutional symptoms
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Lesions of primary attack of Herpes Simplex
1- vesicles and bullae on an erythematous edematous base affecting certain sites
2- no tendency to grouping
3- enlarged and tender L.N.
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Clinical types
1- Gingivo-stomatitis
2- Kerato-conjunctivitis
3- Herpes progentalis
4- Anorectal
5- inoculation Herpes (Herpetic
whitlow)
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6- Neonatal Herpes
1- acquired during birth
2- maternal herpes
3- 50% mortality
4- C.S. Is indicated
5- ttt by IV acyclovoir
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7- Eczema Herpeticum
1- HS in atopic patient
2- generalized lesions regardless their atopic status whether active or not
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Fate of the primary infection
1- spontaneous recovery within 7 days
2- latent (dormant) in sensory ganglia
3- re-activation
4- 2ry attack
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Triggering factors
1- fever
2- URTI
3- menses
4- exposure to sun
5- emotional stress
6- GIT disturbance
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symptoms
1- no constitutional symptoma
2- tingling sensation
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Lession of 2ry attack of HS
1- grouped vesicles on erythematous and edematous base
2- no LN enlargement
3- clear, cloudy, crust
4- normal skin on recovery
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Clinical types of 2ry attack
1- Herpes Facialis
2- Herpetic kerato-conjunctivitis
3- Herpes gentalis
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Herpes Simplex
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Diagnosis
1- Clinical picture
2- Tzank Smear
3- Histopatholoy
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Treatment of Herpes Simplex
1- topical ttt
2- systemic ttt
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Topical treatment of Herpes Simplex
1- Gentian violet 2%
2- Boric acid 2 – 4%
3- topical antibiotic
4- topical Acyclovir
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Systemic treatment of Herpes Simplex
1- Antibiotics
2- Acyclovir 400 mg/ 4 hours for 7 days
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Thank You
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Varicella Zoster
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Common Criteria of Herpetic infections
1- clinical recovery
2- no viral eradication
3- dormant
4- reactivation
5- 2ry attack
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Varicella (chickenpox)
Aetiology
It is a primary infection with Varicella Zoster virus
Incubation peroid
2 - 3 weeks
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Mode of infection
1- droplet infection
2- direct contact
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Symptoms
1- mild fever
2- malaise
3- Anorexia
4- itching
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Site
1- trunk
2- mucous membrane
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Lesions of Varicella
1- sudden appearance
2- in crops
3- pleomorphic
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Fate of the primary infection
1- spontaneous recovery within 7-10 days
2- crusts fall leaving normal skin.
3- scarring only with 2ry bacterial infction
4- latent (dormant) in sensory ganglia
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Chickenpox and pregnancy
- Infection with VZV during pregnancy
-- congenital anomalies
-- fetal chickenpox
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Varicella
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Diagnosis
1- Clinical picture
2- Tzank Smear
3- Histopatholoy
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Treatment of Varicella
1- topical ttt
2- systemic ttt
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Topical treatment of Herpes Simplex
1- soothing and drying agent (calamine)
2- topical antibiotic
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Systemic treatment of Varicella
1- Antibiotics
2- antihistaminic agent for itching
3- Acyclovir 800 mg/ 4 hours for 7 days
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Herpes Zoster
Reactivation of latent VZV in the dorsal root or cranial nerve ganglion cells
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Triggering factors
1- radiation therapy
2- neoplasm
3- immunosuppressive drugs
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Symptoms
Pain
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Site
1- unilateral
2- dermatomal
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Lesions of H. Z
1- grouped vesicles on an erythematous edematous base
2- along the distribution of sensory nerve
3- tender L N
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Herpes Zoster Ophthalmicus
Lesions on the tip of nose are associated with involvement of nasociliary branch of the ophthalmic division of trigeminal nerve with the occurrence of Kerato-conjunctivitis
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Ramzy Hunt Syndrome
Lesions on the ear pinna are associated with affection of the geniculate ganglia (VII nerve) leading to
- 1- ear pain
- 2- loss of taste ant 2/3 of tongue
- 3- facial palsy
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Disseminated H Z
- IMMUNOCOMPROMIZED
- HODGKIN’S LYMPHOMA
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Fate of H Z
1- spontaneous recovery within 7-15 days
2- crusts fall leaving normal skin.
3- scarring may occur with or without 2ry bacterial infection
4- post-herpetic neuralgia
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Herpes Zoster
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Diagnosis
1- Clinical picture
2- Tzank Smear
3- Histopatholoy
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Treatment of H Z
1- topical ttt
2- systemic ttt
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Topical treatment of Herpes Simplex
1- soothing and drying agent (calamine)
2- topical antibiotic
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Systemic treatment of Varicella
1- Analgesics
2- Antibiotics
3- Acyclovir 800 mg/ 4 hours for 7-10 days
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Warts (Verrucae)
- Common benign tumor
- Caused by Human Papilloma Virus (HPV)
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MODE OF TRANSMISSION
DIRECT CONTACT
AUTO-INOCULATION
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Common Warts (Verruca Vulgaris)
- Asymptomatic
-- Hands and sites of trauma
-- hyperkeratotic papules, rough papillary surface, dry, skin coloured or darker, usually multiple.
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Plane Warts (Verruca Plana)
- Common in children
- face and back of hands
-- flat-topped papules, dry, skin coloured or darker, in tens or hundreds.
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Filiform Warts (Verruca Filiformis)
- Asymptomatic
- neck and eyelids
- long slender growths
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Plantar and Palmar Warts (Verruca plataris and palmaris)
- Painful and tender (pressure on nerve)
- palms and soles
- exophytic or usually endophytic, single or multiple.
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Genital Warts (Condyloma Acuminata)
- Usually STDs
- Genital area peri-anal, and pubic area
-- pedunculated, soft, friable lobulated mass (cauliflower), bright red and bleeds easily on touch.
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Verruca Vulgaris
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Treatment of Warts
- Electrocautery
- Cryotherapy
- Laser therapy
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Topical Treatment of Warts
- Topical Retinoic acid derivatives
- Topical Salicylic acid (3 – 6%)
-- Topical saliclic and lactic acid
- Topical TCA
- Podophyllin 15%
- Imiquimod cream stimulates local IFN production
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Molluscum Contagiosum
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Molluscum Contagiosum
Aetiology
Pox virus
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Mode of infection
1- direct contact
2- indirect contact (toilet seats)
3 STDs
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Clinical picture of Molluscum Contagiosum
- common in children
- face, neck, trunk
- usually multiple
- pearly white smooth, round and slightly umbilicated papules. On squeezing a white cheesy material can be expressed.
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Molluscum Contagiosum
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Treatment of Molluscum
- Simple mechanical expression
- Electrocautery
- Cryotherapy
- Laser therapy
- Chemical cautery: conc phenol
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Thank you