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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588 maps found
Region Location Program stage Years Maps Data
Southern Africa Namibia MDA/PC rounds (Geographic) 1990 - 2016 Download map
Southern Africa Botswana MDA/PC rounds (Therapeutic) 2013 - 2016 Download map
Southern Africa Botswana MDA/PC coverage (Therapeutic) 2014 Download map
Eastern Africa Uganda MDA/PC coverage (Therapeutic) 2014 Download map
Southern Africa Zambia MDA/PC rounds (Geographic) 2013 - 2016 Download map
Western Africa Senegal MDA/PC coverage (Therapeutic) 2016 Download map
Southern Africa Botswana MDA/PC rounds (Geographic) 2013 - 2016 Download map
Eastern Africa Uganda MDA/PC coverage (Geographic) 2014 Download map
Western Africa Sierra Leone 2017 Download map
Western Africa Niger MDA/PC coverage (Geographic) 2016 Download map
Western Africa Niger MDA/PC coverage (Geographic) 2015 Download map
Eastern Africa Comoros MDA/PC coverage (Geographic) 2014 Download map
Eastern Africa Tanzania (Mainland) MDA/PC coverage (Therapeutic) 2015 Download map
Western Africa The Gambia MDA/PC rounds (Geographic) 2013 - 2016 Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC rounds (Therapeutic) 2013 - 2016 Download map
Western Africa Liberia MDA/PC coverage (Therapeutic) 2015 Download map
Central Africa Angola MDA/PC coverage (Therapeutic) 2015 Download map
Southern Africa Lesotho MDA/PC rounds (Therapeutic) 2013 - 2016 Download map
Central Africa Central African Republic MDA/PC rounds (Geographic) 1990 - 2016 Download map
Central Africa Sao Tome & Principe MDA/PC rounds (Geographic) 1990 - 2016 Download map
Western Africa Cape Verde MDA/PC coverage (Therapeutic) 2013 Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Geographic) 2013 Download map
Western Africa Senegal MDA/PC coverage (Therapeutic) 2013 Download map
Central Africa Republic of Congo 2017 Download map
Southern Africa Zimbabwe MDA/PC coverage (Geographic) 2015 Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Geographic) 2014 Download map
Central Africa Republic of Congo MDA/PC coverage (Geographic) 2013 Download map
Western Africa Liberia MDA/PC coverage (Therapeutic) 2016 Download map
Western Africa Niger MDA/PC rounds (Geographic) 1990 - 2016 Download map
Western Africa Cape Verde MDA/PC rounds (Therapeutic) 2013 - 2016 Download map
Central Africa Cameroon MDA/PC coverage (Therapeutic) 2014 Download map
Western Africa Senegal MDA/PC coverage (Therapeutic) 2014 Download map
Western Africa Togo MDA/PC rounds (Geographic) 2013 - 2016 Download map
Western Africa Benin MDA/PC coverage (Therapeutic) 2016 Download map
Western Africa Cape Verde MDA/PC rounds (Geographic) 2013 - 2016 Download map
Southern Africa Zimbabwe MDA/PC coverage (Geographic) 2016 Download map
Western Africa Senegal MDA/PC coverage (Geographic) 2013 Download map
Western Africa The Gambia MDA/PC coverage (Therapeutic) 2014 Download map
Western Africa Liberia MDA/PC coverage (Geographic) 2015 Download map
Central Africa Equatorial Guinea 2017 Download map
Central Africa Democratic Republic of the Congo Impact Assessment (Skin Biopsy) Download map
Central Africa Equatorial Guinea Mapping Surveys (Skin Biopsy) 2013 - 2015 Download map
Western Africa Cote d’Ivoire Mapping Surveys (Nodule Palpation) 2014 Download map
Central Africa Democratic Republic of the Congo Mapping Surveys (Nodule Palpation) 2000 - 2014 Download map
Eastern Africa Tanzania (Mainland) Impact Assessment (Skin Biopsy) Download map
Western Africa Liberia Mapping Surveys (Nodule Palpation) 1998 Download map
Central Africa Gabon Mapping Surveys (Anti-Ov16 test) 2015 Download map
Central Africa Angola Mapping Surveys (Skin Biopsy) 2015 Download map
Eastern Africa Tanzania (Mainland) Mapping Surveys (Nodule Palpation) 1996 - 2012 Download map
Central Africa Republic of Congo Impact Assessment (Skin Biopsy) Download map
Western Africa Cote d’Ivoire Mapping Surveys (Skin Biopsy) 2014 Download map
Central Africa Republic of Congo Mapping Surveys (Nodule Palpation) 2003 Download map
Western Africa Nigeria Impact Assessment (Skin Biopsy) Download map
Central Africa Chad Mapping Surveys (Nodule Palpation) 2013 Download map
Central Africa Democratic Republic of the Congo Mapping Surveys (Anti-Ov16 test) 2015 Download map
Eastern Africa South Sudan Mapping Surveys (Nodule Palpation) 1996 - 2008 Download map
Central Africa Democratic Republic of the Congo Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map
Central Africa Chad Impact Assessment (Skin Biopsy) Download map
Central Africa Central African Republic Mapping Surveys (Nodule Palpation) 1999 - 2001 Download map
Southern Africa Malawi Impact Assessment (Skin Biopsy) Download map
Eastern Africa Tanzania (Mainland) Mapping Surveys (Skin Biopsy) 2014 Download map
Eastern Africa Kenya Mapping Surveys (Nodule Palpation) Download map
Eastern Africa Rwanda Mapping Surveys (Nodule Palpation) Download map
Central Africa Republic of Congo Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map
Central Africa Central African Republic Impact Assessment (Skin Biopsy) Download map
Central Africa Cameroon Mapping Surveys (Nodule Palpation) 1993 - 2013 Download map
Western Africa Liberia Impact Assessment (Skin Biopsy) Download map
Western Africa Nigeria Mapping Surveys (Skin Biopsy) 2015 Download map
Central Africa Gabon Mapping Surveys (Nodule Palpation) 1999 - 2014 Download map
Western Africa Nigeria Mapping Surveys (Nodule Palpation) 1989 - 2011 Download map
Central Africa Cameroon Impact Assessment (Skin Biopsy) Download map
Central Africa Chad Mapping Surveys (Skin Biopsy) 2013 - 2014 Download map
Central Africa Burundi Mapping Surveys (Nodule Palpation) 2001 - 2013 Download map
Eastern Africa Ethiopia Impact Assessment (Skin Biopsy) Download map
Central Africa Gabon Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map
Eastern Africa Ethiopia Mapping Surveys (Nodule Palpation) 2001 - 2012 Download map
Southern Africa Mozambique Mapping Surveys (Nodule Palpation) 2001 - 2007 Download map
Central Africa Burundi Impact Assessment (Skin Biopsy) Download map
Central Africa Cameroon Mapping Surveys (Skin Biopsy) 2013 Download map
Central Africa Angola Mapping Surveys (Nodule Palpation) 2002 - 2011 Download map
Central Africa Equatorial Guinea Impact Assessment (Skin Biopsy) Download map
Eastern Africa Ethiopia Mapping Surveys (Skin Biopsy) 2012 - 2014 Download map
Central Africa Equatorial Guinea Mapping Surveys (Nodule Palpation) 1999 - 2013 Download map
Eastern Africa Uganda Impact Assessment (Skin Biopsy) Download map
Southern Africa Malawi Mapping Surveys (Nodule Palpation) 1998 Download map
Western Africa Nigeria Mapping Surveys (Anti-Ov16 test) 2015 Download map
Central Africa Burundi Mapping Surveys (Skin Biopsy) 2013 Download map
Eastern Africa Uganda Mapping Surveys (Nodule Palpation) 2008 Download map

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