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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?

Paralyses and kills the microfilariae Signup and view all the answers

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

Annually Signup and view all the answers

What is the primary cause of blindness in onchocerciasis?

Corneal and retinal lesions Signup and view all the answers

What is the characteristic of an onchocercoma nodule?

Movable and painless Signup and view all the answers

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

Loss of elasticity of the skin and enlarged lymph nodes Signup and view all the answers

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

All of the above Signup and view all the answers

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

Inflammation and scratching Signup and view all the answers