CeDEx Seminar - Jason Abaluck (Yale School of Management)

The Impact of Community Masking on COVID-19: A Cluster-Randomized Trial in Bangladesh

Abstract:

We conducted a cluster-randomized trial to measure the effect of community-level mask distribution and promotion on symptomatic SARS-CoV-2 infections in rural Bangladesh from November 2020 to April 2021 (N = 600 villages, N = 342,126 adults). We cross-randomized mask type (cloth vs. surgical) and promotion strategies at the village and household level. Proper mask-wearing increased from 13.3% in the control group to 42.3% in the  intervention arm (adjusted percentage point difference = 0.29 [0.27, 0.31]). The intervention reduced symptomatic seroprevalence (adjusted prevalence ratio (aPR) = 0.91 [0.82, 1.00]), especially among adults 60+ years in villages where surgical masks were distributed (aPR = 0.65 [0.46, 0.85]). Mask distribution and promotion was a scalable and effective method to reduce symptomatic SARS-CoV-2 infections.