Indoor residual spraying for malaria control in sub-Saharan Africa 1997 to 2017: an adjusted retrospective analysis.

BACKGROUND: Indoor residual spraying (IRS) is a key tool for controlling and eliminating malaria by targeting vectors. To support the development of effective intervention strategies it is important to understand the impact of vector control tools on malaria incidence and on the spread of insecticide resistance. In 2006, the World Health Organization (WHO) stated that countries should report on coverage and impact of IRS, yet IRS coverage data are still sparse and unspecific. Here, the subnational coverage of IRS across sub-Saharan Africa for the four main insecticide classes from 1997 to 2017 were estimated. METHODS: Data on IRS deployment were collated from a variety of sources, including the President's Malaria Initiative spray reports and National Malaria Control Programme reports, for all 46 malaria-endemic countries in sub-Saharan Africa from 1997 to 2017. The data were mapped to the applicable administrative divisions and the proportion of households sprayed for each of the four main insecticide classes; carbamates, organochlorines, organophosphates and pyrethroids was calculated. RESULTS: The number of countries implementing IRS increased considerably over time, although the focal nature of deployment means the number of people protected remains low. From 1997 to 2010, DDT and pyrethroids were commonly used, then partly replaced by carbamates from 2011 and by organophosphates from 2013. IRS deployment since the publication of resistance management guidelines has typically avoided overlap between pyrethroid IRS and ITN use. However, annual rotations of insecticide classes with differing modes of action are not routinely used. CONCLUSION: This study highlights the gaps between policy and practice, emphasizing the continuing potential of IRS to drive resistance. The data presented here can improve studies on the impact of IRS on malaria incidence and help to guide future malaria control efforts.

Expanding the Role of Women in Vector Control: Case Studies From Madagascar, Rwanda, and Zambia.

BACKGROUND: Historically, vector control, including entomological monitoring, has been a field dominated by men. Each year, the U.S. President's Malaria Initiative (PMI) VectorLink project hires 50,000 to 70,000 seasonal workers across the countries in which it works to implement vector control activities, creating an economic opportunity for both men and women. Remaining barriers to women's employment in vector control include social and cultural norms regarding acceptability of formal employment for women, perceptions that women are not fit to serve as spray operators, and a historical context of male-dominated fields such as entomology. METHODS: We use PMI VectorLink project data from Madagascar, Rwanda, and Zambia for 2019-2021 and key informant interviews with project staff in these countries to examine levels of female employment, effectiveness and efficiency of female versus male malaria spray operators, and strategies to expand the role of women in vector control. RESULTS: The percentage of female seasonal employees ranges from 25% in Madagascar to 32% in Rwanda and 45% in Zambia. The percentage of women in leadership positions ranges from 32% in Madagascar and Rwanda to 38% in Zambia. Men and women are equally effective and efficient as spray operators. Best practices for recruiting and retaining women in vector control include engaging community leaders in recruitment, implementing affirmative action hiring policies, mentoring women to progress to leadership positions, and ensuring equitable, safe, and attractive workplaces. DISCUSSION: As vector control programs transition away from donor funding and are increasingly government led, sustaining gains in female empowerment is critical. Country programs should work closely with national, regional, district, and local leaders to demonstrate the importance of hiring women in vector control-including leadership positions-and the impact on female economic empowerment, community well-being, and success of vector control programs.

People-centred surveillance: a narrative review of community-based surveillance among crisis-affected populations.

Outbreaks of disease in settings affected by crises grow rapidly due to late detection and weakened public health systems. Where surveillance is underfunctioning, community-based surveillance can contribute to rapid outbreak detection and response, a core capacity of the International Health Regulations. We reviewed articles describing the potential for community-based surveillance to detect diseases of epidemic potential, outbreaks, and mortality among populations affected by crises. Surveillance objectives have included the early warning of outbreaks, active case finding during outbreaks, case finding for eradication programmes, and mortality surveillance. Community-based surveillance can provide sensitive and timely detection, identify valid signals for diseases with salient symptoms, and provide continuity in remote areas during cycles of insecurity. Effectiveness appears to be mediated by operational requirements for continuous supervision of large community networks, verification of a large number of signals, and integration of community-based surveillance within the routine investigation and response infrastructure. Similar to all community health systems, community-based surveillance requires simple design, reliable supervision, and early and routine monitoring and evaluation to ensure data validity. Research priorities include the evaluation of syndromic case definitions, electronic data collection for community members, sentinel site designs, and statistical techniques to counterbalance false positive signals.