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 Central African Republic MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Chad Mapping Surveys (Nodule Palpation) 2013 Download map png Download map
Central Africa Central African Republic MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Equatorial Guinea Mapping Surveys (Nodule Palpation) 1999 - 2013 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Angola MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Angola MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Central African Republic Mapping Surveys (Nodule Palpation) 1999 - 2001 Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Republic of Congo Impact Assessment (Skin Biopsy) Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Chad MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Chad Endemicity 2017 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Chad MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Gabon MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Gabon Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Angola MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Central Africa Gabon MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Gabon Endemicity 2017 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Chad MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Central Africa Chad MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Angola Mapping Surveys (Skin Biopsy) 2015 Download map png Download map
Central Africa Sao Tome & Principe Endemicity 2017 Download map png Download map
Central Africa Chad MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Chad MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Burundi MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Cameroon MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Cameroon Mapping Surveys (Nodule Palpation) 1993 - 2013 Download map png Download map
Central Africa Cameroon Endemicity 2017 Download map png Download map
Central Africa Democratic Republic of the Congo Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Geographic coverage) 2013 Download map png Download map
Central Africa Gabon MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Burundi MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Burundi Mapping Surveys (Nodule Palpation) 2001 - 2013 Download map png Download map
Central Africa Democratic Republic of the Congo Endemicity 2017 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Burundi MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Republic of Congo Endemicity 2017 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Angola MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Republic of Congo Mapping Surveys (Skin Biopsy) 2014 - 2015 Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Burundi Impact Assessment (Skin Biopsy) Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Angola MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Republic of Congo MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Burundi MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Burundi MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Gabon MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Cameroon Mapping Surveys (Skin Biopsy) 2013 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Angola MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Burundi MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Burundi MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Republic of Congo Mapping Surveys (Nodule Palpation) 2003 Download map png Download map
Central Africa Central African Republic Endemicity 2017 Download map png Download map
Central Africa Angola MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Gabon MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Republic of Congo MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Angola Mapping Surveys (Nodule Palpation) 2002 - 2011 Download map png Download map
Central Africa Gabon MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Central African Republic MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Angola MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Central African Republic Impact Assessment (Skin Biopsy) Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Republic of Congo MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Chad MDA/PC coverage (Therapeutic coverage) 2014 Download map png Download map
Central Africa Burundi Endemicity 2017 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Therapeutic coverage) 2016 Download map png Download map
Central Africa Gabon MDA/PC coverage (Geographic coverage) 2014 Download map png Download map
Central Africa Burundi MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Gabon MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Cameroon MDA/PC rounds (Therapeutic coverage) 2013 - 2016 Download map png Download map
Central Africa Democratic Republic of the Congo MDA/PC coverage (Therapeutic coverage) 2015 Download map png Download map
Central Africa Cameroon MDA/PC coverage (Geographic coverage) 2016 Download map png Download map
Central Africa Equatorial Guinea MDA/PC coverage (Therapeutic coverage) 2013 Download map png Download map
Central Africa Equatorial Guinea MDA/PC rounds (Geographic coverage) 2013 - 2016 Download map png Download map
Central Africa Burundi MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Sao Tome & Principe MDA/PC coverage (Geographic coverage) 2015 Download map png Download map
Central Africa Gabon Mapping Surveys (Nodule Palpation) 1999 - 2014 Download map png Download map

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