House modifications for preventing malaria

Area of Science:

• Public Health Entomology
• Infectious Disease Control
• Environmental Health

Background:

• Malaria remains a significant global health challenge, with progress in control efforts plateauing.
• Traditional malaria control methods face challenges, necessitating exploration of novel vector control strategies.
• Historical and recent research suggests house modifications, such as blocking mosquito entry points, may reduce malaria transmission.

Purpose of the Study:

• To evaluate the impact of house modifications on malaria incidence and transmission.
• To synthesize evidence from controlled trials assessing the efficacy of housing interventions for malaria prevention.

Main Methods:

• Systematic search of multiple databases (Cochrane, MEDLINE, Embase, CAB Abstracts, LILACS) and clinical trial registries.
• Inclusion of randomized controlled trials (RCTs), cluster-RCTs, and quasi-experimental studies reporting epidemiological malaria outcomes.
• Data extraction and risk of bias assessment by two independent reviewers; meta-analysis using risk ratios, mean differences, and rate ratios.

Main Results:

• Six cluster-RCTs conducted in sub-Saharan Africa were included, focusing on screening of windows, doors, eaves, or ceilings.
• Screening interventions showed potential to reduce clinical malaria incidence (low-certainty evidence) and entomological inoculation rates (low-certainty evidence).
• One trial indicated a reduction in anemia prevalence (moderate-certainty evidence) associated with screening; bed net usage showed mixed results.

Conclusions:

• Preliminary evidence suggests that house screening may decrease malaria transmission and infection rates within households.
• Further evidence is anticipated from four ongoing trials that will be incorporated into future reviews.
• House modification represents a promising supplementary tool for malaria vector control.