Blackflies And Oncocerchiasis

Question 1

Disease caused by oncocerchiasis volvulus

Answer 1

River blindness

Question 2

Species name for blackflies

Answer 2

Simulium damnosum

Question 3

Where are blackflies found?

Answer 3

Near fast flowing water where they lay their eggs

Question 4

Make and female blackflies take blood meals. True or false?

Answer 4

False

Only females take blood meals

Question 5

Black flies are vicious biters. True or false?

Answer 5

True.

Nasty little fuckers

Question 6

Blackfly control includes?

Answer 6

Larvicides praying of fast flowing rivers

DEET repellant

Question 7

Where do adult oncocercha live?

Answer 7

In subcutaneous tissues

Question 8

Describe oncocercha life cycle

Answer 8

L3 larvae enter skin in blood meal
Migrate to subcutaneous tissue
Mature into adults and mate
Unsheathed mff migrate to dermis other other places (eyes)
Ingested by blackflies where they mature

Question 9

Pathology of river blindness

Answer 9

Sub-cutaneous nodules on head arms or other skin areas

Mff death on skin causes intense itching, depigmentation, elephantiasis, loss of elasticity

Death of mff in eye can cause river blindness

Question 10

Diagnosis of river blindness

Answer 10

Skin snips

Skin patch test

Question 11

Treatment of river blindness

Answer 11

Ivermectin

Doxycycline will kill wolbachia

Question 12

What do black flies transmit?

Answer 12

Onchocerciasis volvulus