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Onchocerciasis: River Blindness Disease and its Vectors
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Onchocerciasis: River Blindness Disease and its Vectors

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Questions and Answers

What is the result of chronic inflammation and scratching on the skin in onchocercal atrophy?

  • Papular onchodermatitis
  • Leopard skin depigmentation (correct)
  • Lizard Skin
  • Onchocercal atrophy

    • What is the purpose of skin snip biopsy in the diagnosis of onchocercal atrophy?

  • To elevate a small cone of skin for parasitological diagnosis (correct)
  • To relieve intense itching
  • To kill the microfilariae
  • To remove the adult worm

    • What is the breeding requirement for the black fly vector in onchocercal atrophy?

  • Dry land
  • Slow-flowing rivers
  • Stagnant water
  • Highly oxygenated water (correct)

    • What is the effect of ivermectin on the microfilariae in onchocercal atrophy?

    <p>Paralyses and kills the microfilariae</p> Signup and view all the answers

    How often is ivermectin administered in the treatment of onchocercal atrophy?

    <p>Annually</p> Signup and view all the answers

    What is the primary cause of blindness in onchocerciasis?

    <p>Corneal and retinal lesions</p> Signup and view all the answers

    What is the characteristic of an onchocercoma nodule?

    <p>Movable and painless</p> Signup and view all the answers

    What is the result of chronic onchodermatitis in the inguinal area?

    <p>Loss of elasticity of the skin and enlarged lymph nodes</p> Signup and view all the answers

    What is the skin change associated with long-standing and heavy infections of onchocerciasis?

    <p>All of the above</p> Signup and view all the answers

    What is the reason for the characteristic 'leopard skin' appearance in onchocerciasis?

    <p>Inflammation and scratching</p> Signup and view all the answers

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