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
Eastern Africa Ethiopia Mapping Surveys (Nodule Palpation) 2001 - 2012 Download map
Central Africa Equatorial Guinea Mapping Surveys (Nodule Palpation) 1999 - 2013 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
Central Africa Republic of Congo Mapping Surveys (Nodule Palpation) 2003 Download map
Central Africa Central African Republic Mapping Surveys (Nodule Palpation) 1999 - 2001 Download map
Central Africa Cameroon Mapping Surveys (Nodule Palpation) 1993 - 2013 Download map
Central Africa Burundi Mapping Surveys (Nodule Palpation) 2001 - 2013 Download map
Central Africa Angola Mapping Surveys (Nodule Palpation) 2002 - 2011 Download map
Eastern Africa Uganda Mapping Surveys (Nodule Palpation) 2008 Download map
Eastern Africa Tanzania (Mainland) Mapping Surveys (Nodule Palpation) 1996 - 2012 Download map
Eastern Africa South Sudan Mapping Surveys (Nodule Palpation) 1996 - 2008 Download map
Eastern Africa Rwanda Mapping Surveys (Nodule Palpation) Download map
Western Africa Nigeria Mapping Surveys (Nodule Palpation) 1989 - 2011 Download map
Southern Africa Mozambique Mapping Surveys (Nodule Palpation) 2001 - 2007 Download map
Southern Africa Malawi Mapping Surveys (Nodule Palpation) 1998 Download map
Western Africa Liberia Mapping Surveys (Nodule Palpation) 1998 Download map
Central Africa Chad Mapping Surveys (Nodule Palpation) 2013 Download map
Eastern Africa Tanzania (Mainland) Mapping Surveys (Skin Biopsy) 2014 Download map
Western Africa Nigeria Mapping Surveys (Skin Biopsy) 2015 Download map
Central Africa Gabon Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map
Eastern Africa Ethiopia Mapping Surveys (Skin Biopsy) 2012 - 2014 Download map
Central Africa Equatorial Guinea Mapping Surveys (Skin Biopsy) 2013 - 2015 Download map
Western Africa Cote d’Ivoire Mapping Surveys (Skin Biopsy) 2014 Download map
Central Africa Democratic Republic of the Congo Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map
Central Africa Republic of Congo Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map
Central Africa Chad Mapping Surveys (Skin Biopsy) 2013 - 2014 Download map
Central Africa Cameroon Mapping Surveys (Skin Biopsy) 2013 Download map
Central Africa Burundi Mapping Surveys (Skin Biopsy) 2013 Download map
Central Africa Angola Mapping Surveys (Skin Biopsy) 2015 Download map
Eastern Africa Uganda Impact Assessment (Skin Biopsy) Download map
Eastern Africa Tanzania (Mainland) Impact Assessment (Skin Biopsy) Download map
Western Africa Nigeria Impact Assessment (Skin Biopsy) Download map
Southern Africa Malawi Impact Assessment (Skin Biopsy) Download map
Western Africa Liberia Impact Assessment (Skin Biopsy) Download map
Eastern Africa Ethiopia Impact Assessment (Skin Biopsy) Download map
Central Africa Equatorial Guinea Impact Assessment (Skin Biopsy) Download map
Central Africa Democratic Republic of the Congo Impact Assessment (Skin Biopsy) Download map
Central Africa Republic of Congo Impact Assessment (Skin Biopsy) Download map
Central Africa Chad Impact Assessment (Skin Biopsy) Download map
Central Africa Central African Republic Impact Assessment (Skin Biopsy) Download map
Central Africa Cameroon Impact Assessment (Skin Biopsy) Download map
Central Africa Burundi Impact Assessment (Skin Biopsy) Download map
Southern Africa Botswana 2017 Download map
Central Africa Burundi 2017 Download map
Central Africa Angola 2017 Download map
Western Africa Burkina Faso 2017 Download map
Central Africa Central African Republic 2017 Download map
Western Africa Algeria 2017 Download map
Central Africa Republic of Congo 2017 Download map
Central Africa Democratic Republic of the Congo 2017 Download map
Eastern Africa Ethiopia 2017 Download map
Western Africa Cote d’Ivoire 2017 Download map
Western Africa Benin 2017 Download map
Western Africa Cape Verde 2017 Download map
Central Africa Cameroon 2017 Download map
Southern Africa Zimbabwe 2017 Download map
Western Africa Mauritania 2017 Download map
Eastern Africa Tanzania (Zanzibar) 2017 Download map
Eastern Africa Uganda 2017 Download map
Southern Africa Zambia 2017 Download map
Southern Africa South Africa 2017 Download map
Eastern Africa Tanzania (Mainland) 2017 Download map
Western Africa Togo 2017 Download map
Central Africa Chad 2017 Download map
Central Africa Sao Tome & Principe 2017 Download map
Eastern Africa South Sudan 2017 Download map
Western Africa Senegal 2017 Download map
Western Africa Sierra Leone 2017 Download map
Eastern Africa Seychelles 2017 Download map
Eastern Africa Rwanda 2017 Download map
Western Africa Nigeria 2017 Download map
Western Africa Niger 2017 Download map
Southern Africa Namibia 2017 Download map
Southern Africa Mozambique 2017 Download map
Southern Africa Malawi 2017 Download map
Eastern Africa Madagascar 2017 Download map
Southern Africa Lesotho 2017 Download map
Western Africa Liberia 2017 Download map
Eastern Africa Comoros 2017 Download map
Eastern Africa Kenya 2017 Download map
Western Africa Guinea-Bissau 2017 Download map
Central Africa Equatorial Guinea 2017 Download map
Western Africa Guinea 2017 Download map
Western Africa The Gambia 2017 Download map
Western Africa Ghana 2017 Download map
Central Africa Gabon 2017 Download map
Southern Africa eSwatini 2017 Download map

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