Accelerating river blindness elimination by supplementing MDA with a vegetation "slash and clear" vector control...

Area of Science:

• Public Health and Tropical Medicine
• Mathematical Modeling in Epidemiology
• Vector Control Strategies

Background:

• Neglected tropical diseases (NTDs) require accelerated progress toward global elimination goals.
• River blindness (onchocerciasis) is a major NTD targeted for elimination, with traditional vector control facing limitations.
• The "slash and clear" technique shows promise in reducing Simulium damnosum black fly biting density.

Purpose of the Study:

• To investigate the potential impact of the "slash and clear" intervention on human onchocerciasis infection.
• To model the effect of vegetation clearing on black fly biting rates and disease transmission.
• To assess the contribution of "slash and clear" to achieving onchocerciasis elimination goals.

Main Methods:

• Development of a novel mathematical model for the "slash and clear" intervention's effect on seasonal black fly biting rates.
• Coupling the "slash and clear" model with a population dynamics model of Onchocerca volvulus transmission.
• Utilizing a Bayesian data-driven approach to analyze intervention impact.

Main Results:

• Supplementing annual drug treatments with "slash and clear" significantly accelerates onchocerciasis elimination.
• The intervention's efficacy is robust to the timing of implementation, with meaningful impact from annual clearing.
• "Slash and clear" effectively reduces Simulium damnosum biting density, a key factor in disease transmission.

Conclusions:

• The "slash and clear" technique is a valuable, sustainable addition to drug treatments for onchocerciasis elimination.
• This community-driven intervention offers an important option for achieving and sustaining river blindness elimination.
• Mathematical modeling demonstrates the significant potential of integrated vector control and treatment strategies.