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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527 maps found
Region Country Program stage Yearssort ascending Maps Data
Southern Africa Namibia MDA/PC coverage (Geographic) 2013 Download map
Eastern Africa Tanzania (Mainland) Mapping Surveys (Nodule Palpation) 1996 - 2012 Download map
Eastern Africa Ethiopia Mapping Surveys (Nodule Palpation) 2001 - 2012 Download map
Central Africa Angola Mapping Surveys (Nodule Palpation) 2002 - 2011 Download map
Western Africa Nigeria Mapping Surveys (Nodule Palpation) 1989 - 2011 Download map
Eastern Africa Uganda Mapping Surveys (Nodule Palpation) 2008 Download map
Eastern Africa South Sudan Mapping Surveys (Nodule Palpation) 1996 - 2008 Download map
Southern Africa Mozambique Mapping Surveys (Nodule Palpation) 2001 - 2007 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
Western Africa Liberia Mapping Surveys (Nodule Palpation) 1998 Download map
Southern Africa Malawi Mapping Surveys (Nodule Palpation) 1998 Download map
Eastern Africa Kenya Mapping Surveys (Nodule Palpation) Download map
Eastern Africa Ethiopia Impact Assessment (Skin Biopsy) Download map
Central Africa Cameroon Impact Assessment (Skin Biopsy) Download map
Western Africa Liberia Impact Assessment (Skin Biopsy) Download map
Central Africa Central African Republic Impact Assessment (Skin Biopsy) Download map
Southern Africa Malawi Impact Assessment (Skin Biopsy) Download map
Central Africa Chad Impact Assessment (Skin Biopsy) Download map
Western Africa Nigeria Impact Assessment (Skin Biopsy) Download map
Central Africa Republic of Congo Impact Assessment (Skin Biopsy) Download map
Eastern Africa Tanzania (Mainland) Impact Assessment (Skin Biopsy) Download map
Central Africa Democratic Republic of the Congo Impact Assessment (Skin Biopsy) Download map
Eastern Africa Rwanda Mapping Surveys (Nodule Palpation) Download map
Eastern Africa Uganda Impact Assessment (Skin Biopsy) Download map
Central Africa Equatorial Guinea Impact Assessment (Skin Biopsy) Download map
Central Africa Burundi Impact Assessment (Skin Biopsy) Download map

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