Onchocerciasis

Infection transmitted by the bite of infected blackflies causing severe itching and eye lesions as the adult worm produces larvae and leading to visual impairment and permanent blindness.

The filarial worms (O. volvulus) are transmitted by the repeated bites of infected black flies (Simulium spp.) . These black flies breed in fast-flowing rivers and streams, mostly in remote villages located near fertile land where people rely on agriculture.

In human, female adult worms produce embryonic larvae (microfilariae) that migrate to the skin, eyes and other organs. When a female black fly bites an infected person during a blood meal, it also ingests microfilariae which develop further into the infectious L3 stage and are then transmitted to the next human host during subsequent bites.

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574 maps found
Region Country Program stage Years Maps Data
Central Africa Angola MDA/PC coverage (Geographic) 2016 Download map png Download map
Eastern Africa Madagascar Endemicity 2017 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Geographic) 2014 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Geographic) 2013 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Southern Africa Botswana MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Western Africa Sierra Leone MDA/PC coverage (Geographic) 2016 Download map png Download map
Eastern Africa Uganda MDA/PC coverage (Therapeutic) 2013 Download map png Download map
Western Africa Mauritania MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Western Africa Mauritania MDA/PC coverage (Geographic) 2014 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Geographic) 2015 Download map png Download map
Western Africa Togo Endemicity 2017 Download map png Download map
Western Africa Mauritania MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Western Africa Burkina Faso MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Southern Africa South Africa MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Southern Africa Malawi MDA/PC rounds (Therapeutic) 2013 - 2016 Download map png Download map
Southern Africa Lesotho MDA/PC coverage (Geographic) 2013 Download map png Download map
Eastern Africa Seychelles MDA/PC coverage (Geographic) 2013 Download map png Download map
Southern Africa Botswana MDA/PC coverage (Therapeutic) 2015 Download map png Download map
Southern Africa Lesotho MDA/PC coverage (Therapeutic) 2015 Download map png Download map
Western Africa Sierra Leone MDA/PC coverage (Therapeutic) 2015 Download map png Download map
Western Africa Algeria Endemicity 2017 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Geographic) 2016 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Therapeutic) 2013 Download map png Download map
Southern Africa Zimbabwe MDA/PC coverage (Therapeutic) 2013 Download map png Download map
Southern Africa Zimbabwe MDA/PC coverage (Geographic) 2014 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Geographic) 2016 Download map png Download map
Western Africa Guinea Endemicity 2017 Download map png Download map
Western Africa Sierra Leone MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Central Africa Republic of Congo MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Western Africa Nigeria MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Central Africa Angola MDA/PC rounds (Therapeutic) 2013 - 2016 Download map png Download map
Southern Africa Zambia MDA/PC rounds (Therapeutic) 2013 - 2016 Download map png Download map
Southern Africa Zambia MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Western Africa Algeria MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Eastern Africa Comoros MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC coverage (Geographic) 2016 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Therapeutic) 2013 Download map png Download map
Southern Africa Namibia MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Western Africa Nigeria MDA/PC coverage (Geographic) 2014 Download map png Download map
Southern Africa South Africa MDA/PC coverage (Geographic) 2015 Download map png Download map
Eastern Africa Seychelles Endemicity 2017 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Western Africa Sierra Leone MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Western Africa Ghana MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Eastern Africa Seychelles MDA/PC rounds (Therapeutic) 2013 - 2016 Download map png Download map
Western Africa Burkina Faso MDA/PC coverage (Geographic) 2014 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Geographic) 2014 Download map png Download map
Western Africa Guinea MDA/PC coverage (Geographic) 2015 Download map png Download map
Southern Africa Namibia MDA/PC coverage (Geographic) 2015 Download map png Download map
Central Africa Cameroon Endemicity 2017 Download map png Download map
Central Africa Burundi MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Central Africa Republic of Congo MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Western Africa Senegal MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Western Africa Guinea MDA/PC rounds (Therapeutic) 2013 - 2016 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC coverage (Geographic) 2013 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Geographic) 2015 Download map png Download map
Southern Africa Botswana MDA/PC coverage (Geographic) 2013 Download map png Download map
Western Africa Niger MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Southern Africa South Africa MDA/PC coverage (Therapeutic) 2015 Download map png Download map
Southern Africa South Africa MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Southern Africa Malawi MDA/PC coverage (Geographic) 2016 Download map png Download map
Western Africa Burkina Faso MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Western Africa Guinea MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Mali MDA/PC coverage (Geographic) 2016 Download map png Download map
Western Africa Senegal MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Eastern Africa Madagascar MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Western Africa Algeria MDA/PC rounds (Therapeutic) 2013 - 2016 Download map png Download map
Mali MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Western Africa Guinea-Bissau MDA/PC coverage (Geographic) 2013 Download map png Download map
Western Africa Mauritania MDA/PC coverage (Geographic) 2013 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Therapeutic) 2015 Download map png Download map
Western Africa Guinea-Bissau MDA/PC coverage (Therapeutic) 2015 Download map png Download map
Southern Africa Namibia MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Mali Endemicity 2017 Download map png Download map
Western Africa Mauritania MDA/PC coverage (Geographic) 2016 Download map png Download map
Southern Africa Malawi MDA/PC coverage (Therapeutic) 2013 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Therapeutic) 2013 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Geographic) 2014 Download map png Download map
Western Africa Benin MDA/PC coverage (Geographic) 2016 Download map png Download map
Southern Africa Malawi Endemicity 2017 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Geographic) 2014 Download map png Download map
Southern Africa eSwatini MDA/PC coverage (Geographic) 2014 Download map png Download map
Western Africa Senegal MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Central Africa Angola MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Western Africa Guinea-Bissau MDA/PC coverage (Therapeutic) 2016 Download map png Download map
Eastern Africa Seychelles MDA/PC coverage (Geographic) 2016 Download map png Download map
Southern Africa eSwatini MDA/PC coverage (Therapeutic) 2013 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Therapeutic) 2014 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Geographic) 2015 Download map png Download map
Western Africa Senegal MDA/PC coverage (Geographic) 2015 Download map png Download map
Eastern Africa Tanzania (Mainland) Endemicity 2017 Download map png Download map
Central Africa Equatorial Guinea MDA/PC rounds (Geographic) 1990 - 2016 Download map png Download map
Central Africa Angola MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC rounds (Geographic) 2013 - 2016 Download map png Download map
Eastern Africa Madagascar MDA/PC rounds (Therapeutic) 2013 - 2016 Download map png Download map
Eastern Africa Comoros MDA/PC coverage (Geographic) 2013 Download map png Download map
Eastern Africa Rwanda MDA/PC coverage (Geographic) 2013 Download map png Download map
Western Africa Algeria MDA/PC coverage (Therapeutic) 2015 Download map png Download map

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