Ectoparasites Flashcards
What is Tunga penetrans?
Flea, found in tropical areas, people who walk barefoot
What is this?
Tungiasis
Inflammatory nodule with central crater
Once eggs have hatched
Management of tungiasis
Surgical - needles or scissors extraction
What is myiasis?
Infection produced by maggots of certain flies
Most common organism myiasis?
Dermatobia hominis
If in Africa: Cordylobia antropophaga
Key feature of a lesion caused by dermatobia hominus?
Hole is open on lesion - for larvae to come out and in
Put liquid over the hole - can see bubbling
Blister beetle dermatitis - organism? When is it seen and how does it present?
Paederus Dermatitis
Causes a vesicular dermatitis in a linear array like ‘whip lash’
Related to increase T° as in during “ El Niño”
What does paederus rely on?
Presence of pseudomonas in skin
Papular urticaria - caused by? How does it present?
Insect bites - usually around clothing lining
What is the organism causing bed bugs?
Cimex lectularius - 3 in a row
What causes TROMBIDIASIS?
Chiggers (mites)
The classical bite : paroxistic itching, maculae-papule on legs
with central red puncture
Organism for scabies?
Sarcoptes scabiei var. hominis
Life cycle of scabies infection?
Pregnant female burrows under the skin.
2-3 eggs daily for 4-5 weeks, then dies.
Cycle from egg to adult = 15-21 days
Transmission of scabies?
Close contact (including sex)
Characteristic appearance clinically of scabies?
Itching at night, crusted lines
interdigital spaces, wrists, anterior axillary areas, periumbilical skin
In infants : face, palms and soles, with pustules and blisters
Diagnosis? Test for?
Crusted scabies (Norwegian)
HTLV1
