Week 3- Viral & Fungal Skin Infections Flashcards
Vesicles are ususally caused by which viruses?
- Herpes Simplex
- Varicella Zoster
- Poxviruses
- Coxsackie virus
- Entero/echo viruses
What is the incubation period for chickenpox?
21 days
Does chickenpox (varicella) start peripherally or centrally?
Centrally
It is very rare on the hands and feet.
What is a complication of chickenpox?
Varicella Pneuomonitis
What 2 dermatomal branches does Herpes Zoster usually manifest on?
- T5-L2
- The opthalmic branch of the trigeminal nerve
What 2 ways can you diagnose Varicella infection?
- Serology
- VZV IgG- previous exposure - shingles likely.
- VZV IgM - acute infection - chickenpox.
- Direct Immunofluorescence
- Viral swab the base of the lesion.
What is the management for pregnant women who have been exposed to Varicella?
- If immune - no action
- If Unsure or not immunised- check VZV IgG
- VZV IgG present - no action needed.
- VZV IgG not present - Give VZV Antiboies.
What skin infections can herpes simplex cause?
- Gingivostomatitis
- Genital infection
- Eczema Herpeticum
- Herpetic whitlow
- Erythema Multiforme (Mycoplasma and HSV are the most common cause)
- Cold sores
What 2 skin infections does the Coxsackie Virus cause?
- Hand Foot and Mouth
- Herpangina
What viruses cause maculopapular rashes?
- Rubella
- Parvovirus
- Entero/Echovirus
- Measles
- EBV
- CMV
- Dengue
What is the usual manifestation for Slapped Cheek?
- Brief febrile illness withcough
- 7 days of feeling well
- Rash develops around cheeks and then 1-4 days later appears on the limbs.
- It lasts 1-3 weeks.
What is a complication of Parvovirus B19?
Viral arthritis
It is non-destructive and can last up to 1 year.
What virus is usually misdiagnosd as measles?
Roseola Infantum
(HHV6)
In what condition do you get Koplick spots?
Measles
Pityriasis Rosea present with a herald patch and then a maculopapular rash. How long does itlast for?

40 days and 40 nights :-)
What is this and what is it’s treatment?

Pityriasis versicolor
Wood’s lamp=pale yellowfluorescence.
Treatment
- Selsun shampoo
- Ketoconoazole shampoo
- Lamisil
- Oral Imidazoles
What is the treatment for molloscum contagiosum?
- Molludab in the UK
- Immiquimod -if they are widespread and many
- Topical acids - Salicylic or TCA
- Podophyllotoxincream
- Cryotherapy
- Adapelene (Retinoic acid)
- Curretage
What is the most common cause of Erythema Multiforme?
HSV
What is this and what is the treatment?

Tinea Capitis
Oral Griseofulvin 15-20mg/kg/day for 6-8 weeks.
(Hair usualy regrows after and close contacts should be treated with ketoconazole shampoo)
What is this?

hyytr
It is usually wrongly diagnosed as a bacterial infection.
Treatment is with oral antifungals.