Delineation of onchocerciasis operational transmission zones of Burkina Faso

BACKGROUND: Defining the transmission zones for onchocerciasis is a critical first step needed in an endemic country aiming to eliminate the transmission of onchocerciasis. The process focuses on defining the geographical boundaries of areas where onchocerciasis transmission could persist with minimal influence from neighbouring regions. The use of operational transmission zones (OTZs) allows for assessment of interruption of onchocerciasis transmission with greater certainty within endemic countries. METHODS: We used available environmental, epidemiological and entomological data on onchocerciasis in Burkina Faso from the inception of the Onchocerciasis Control Programme to the present day. This information, together with field assessments, allowed delineation of OTZs across the whole country. RESULTS: Six OTZs were identified: Comoé-Léraba, Dienkoa, Bas-Mouhoun, Volta, Boucle du Mouhoun and Gourma. CONCLUSIONS: Delineation of the onchocerciasis OTZs of Burkina Faso will facilitate the implementation of future interventions and assessment of the progress towards disease elimination within the country and bordering regions.