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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550 maps found
Regionsort descending Country Program stage Years Maps Data
Central Africa Chad MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Chad Impact Assessment (Skin Biopsy) Download map png Download map
Central Africa Equatorial Guinea Mapping Surveys (Skin Biopsy) 2013 - 2015 Download map png Download map
Central Africa Gabon MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Angola Endemicity 2017 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Cameroon Impact Assessment (Skin Biopsy) Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Central Africa Burundi Mapping Surveys (Skin Biopsy) 2013 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Gabon MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Central Africa Angola MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Democratic Republic of the Congo Mapping Surveys (Nodule Palpation) 2000 - 2014 Download map png Download map
Central Africa Equatorial Guinea MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Equatorial Guinea Impact Assessment (Skin Biopsy) Download map png Download map
Central Africa Chad Mapping Surveys (Skin Biopsy) 2013 - 2014 Download map png Download map
Central Africa Burundi MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Chad MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Equatorial Guinea Endemicity 2017 Download map png Download map
Eastern Africa Kenya MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Mainland) Mapping Surveys (Skin Biopsy) 2014 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Comoros MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Eastern Africa Seychelles Endemicity 2017 Download map png Download map
Eastern Africa Rwanda MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa Madagascar MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Eastern Africa Uganda MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Eastern Africa Kenya Endemicity 2017 Download map png Download map
Eastern Africa Comoros MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Eastern Africa Uganda Mapping Surveys (Nodule Palpation) 2008 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Eastern Africa Uganda Impact Assessment (Skin Biopsy) Download map png Download map
Eastern Africa Kenya MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Eastern Africa Kenya MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa Comoros MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa Tanzania (Mainland) Mapping Surveys (Nodule Palpation) 1996 - 2012 Download map png Download map
Eastern Africa Kenya MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Seychelles MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa Seychelles MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Seychelles MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa Rwanda MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Eastern Africa Eritrea MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Uganda MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Eastern Africa Seychelles MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Eastern Africa Kenya MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Eastern Africa Seychelles MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Zanzibar) Endemicity 2017 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Eastern Africa Seychelles MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Eastern Africa Comoros MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Madagascar MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Eastern Africa Rwanda MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa South Sudan Mapping Surveys (Nodule Palpation) 1996 - 2008 Download map png Download map
Eastern Africa Seychelles MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Eastern Africa Ethiopia MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Ethiopia MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Eastern Africa Rwanda Mapping Surveys (Nodule Palpation) Download map png Download map
Eastern Africa Ethiopia Impact Assessment (Skin Biopsy) Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Eastern Africa Kenya MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Eastern Africa Kenya MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Eastern Africa Kenya MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Comoros MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Mainland) Impact Assessment (Skin Biopsy) Download map png Download map
Eastern Africa Ethiopia Mapping Surveys (Skin Biopsy) 2012 - 2014 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Eastern Africa South Sudan MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Eastern Africa Tanzania (Mainland) MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Eastern Africa Eritrea MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Eastern Africa Rwanda MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Eastern Africa Madagascar Endemicity 2017 Download map png Download map
Eastern Africa Tanzania (Zanzibar) MDA/PC coverage (Geographic coverage) 2013 Download map png Download map

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