“Slash and Clear”, a Community-Based Vector Control Method to Reduce Onchocerciasis Transmission by Simulium sirbanum in Maridi, South Sudan: A Prospective Study

This study evaluated the effectiveness of a community-based vector control method, “slash and clear,” in reducing black fly populations and Onchocerca volvulus transmission in Maridi County, South Sudan. Conducted at the Maridi dam, a breeding site for Simulium damnosum s.l., the intervention significantly reduced black fly biting rates by over 90% for more than six months and maintained a reduction of under 50% after twelve months. Parity rates also dropped from 13% to 5.6%. The black flies were identified as Simulium sirbanum. These findings suggest that when combined with high ivermectin treatment coverage, annual “slash and clear” interventions can be a cost-effective strategy to accelerate onchocerciasis elimination.

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