Trop Med > Ectoparasites > Flashcards

Ectoparasites Flashcards

(19 cards)

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1
Q

What is Tunga penetrans?

A

Flea, found in tropical areas, people who walk barefoot

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2
Q

What is this?

A

Tungiasis
Inflammatory nodule with central crater
Once eggs have hatched

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3
Q

Management of tungiasis

A

Surgical - needles or scissors extraction

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4
Q

What is myiasis?

A

Infection produced by maggots of certain flies

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5
Q

Most common organism myiasis?

A

Dermatobia hominis
If in Africa: Cordylobia antropophaga

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6
Q

Key feature of a lesion caused by dermatobia hominus?

A

Hole is open on lesion - for larvae to come out and in
Put liquid over the hole - can see bubbling

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7
Q

Blister beetle dermatitis - organism? When is it seen and how does it present?

A

Paederus Dermatitis
Causes a vesicular dermatitis in a linear array like ‘whip lash’
Related to increase T° as in during “ El Niño”

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8
Q

What does paederus rely on?

A

Presence of pseudomonas in skin

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9
Q

Papular urticaria - caused by? How does it present?

A

Insect bites - usually around clothing lining

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10
Q

What is the organism causing bed bugs?

A

Cimex lectularius - 3 in a row

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11
Q

What causes TROMBIDIASIS?

A

Chiggers (mites)
The classical bite : paroxistic itching, maculae-papule on legs
with central red puncture

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12
Q

Organism for scabies?

A

Sarcoptes scabiei var. hominis

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13
Q

Life cycle of scabies infection?

A

Pregnant female burrows under the skin.
2-3 eggs daily for 4-5 weeks, then dies.
Cycle from egg to adult = 15-21 days

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14
Q

Transmission of scabies?

A

Close contact (including sex)

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15
Q

Characteristic appearance clinically of scabies?

A

Itching at night, crusted lines
interdigital spaces, wrists, anterior axillary areas, periumbilical skin
In infants : face, palms and soles, with pustules and blisters

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16
Q

Unusual presentation of scabies?

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A

Nodular scabies
Crusted scabies (immunosuppressed - HTLV1)

17
Q

Diagnosis? Test for?

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A

Crusted scabies (Norwegian)
HTLV1

18
Q

Other diseases associated with crusted scabies?

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A

Lymphoma, Downs, HIV

19
Q

Rx of scabies?

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A

Ivermectin
Also creams: Permethrin

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