River Blindness 2

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River Blindness (Onchocerciasis):

River Blindness ( Onchocerciasis ) By: George Reijer

Break down :

Break down What is river blindness Parasitic nematode Black fly Life cycle How River Blindness Spread Statistics Control/ Treatment

What is River Blindness :

What is River Blindness River blindness is an eye and skin disease caused by a parasitic worm called Onchocerca volvus. It is transmitted to humans through the bite of a blackfly.

What is River Blindness:

What is River Blindness Worms stay under the skin of the host. Connective tissue is destroyed. Eosinophils defend against this worm.

Parasitic Nematode:

Parasitic Nematode Onchocerca volvulus is the genius and species of the nematodes Female-20 inches long Males-5 inches long Produce millions of babies (microfilaria)

Parasitic Nematode:

Parasitic Nematode Wolbachia endosymbionts Lives up to 14 years Travels up to the eye Symptoms manifest between 1-4 years


Blackfly Simulium yahense 12 days to mature Microfilaria enter the thoracic Migrate to proboscis & saliva Hungry for blood

Life Cycle of River Blindness:

Life Cycle of River Blindness

How River Blindness Spread:

How River Blindness Spread Black flies found near fast- running streams 90-99% of the disease occurs in Africa Exported by slave trade

Statistics :

Statistics 18 million people are infected 6.5 million suffer from severe itching or dermatitis. 270,000 are blind

Control and Treatment methods:

Control and Treatment methods Vector Control Medical care: Ivermectin Surgical care


Sources http://actionagainstpoisoning.com/CARE%20AND%20TREATMENT/RIVERBLINDNESSONCHOCERCIASIS/Onchocerciasis.html http://www.histopathology-india.net/Oncho.htm http://www.uniteforsight.org/course/riverblindness.php http://www.who.int/apoc/onchocerciasis/control/en/index.html http://www.asnom.org/en/442_onchocercose.html

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