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| Onchoceriasis is a common cause of blindness
in parts of West Africa.
This FDC was issued in 1971 by the Rebulique de Haute-Volta (now Burkina Faso) to highlight this endemic disease. The stamp and the cover show a black fly (members of the family Simuliidae) which acts as a vector for O. volvulus the parasite responsible for onchoceriasis; two health workers spraying DDT along river to eradicate the black fly larvae and adults; and three women blinded by onchoceriasis being led by a sighted person.
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