This cluster-randomized controlled trial in Bangladesh schools will examine whether low-cost air filtration and/or human-safe ultraviolet germicidal light interventions can reduce the incidence of schoolchildren's respiratory viral infections. The main study objectives are:
1. Pilot and optimize an intervention to filter classroom air.
2. Pilot and optimize an intervention to treat classroom air with ultraviolet light.
3. Assess the separate and combined effect of air filtration and ultraviolet light on the incidence of polymerase chain reaction (PCR) confirmed illness from respiratory viruses.
Methods: The study will take place in 60 government primary schools in Dhaka, Bangladesh. Within each enrolled school, 5 classrooms of students in grades 3, 4 and 5 will be randomly assigned to receive:
1. Box fans with a filter attachment.
2. 220 nanometer (nm) wavelength ultraviolet light air cleaner lamps.
3. Both the box fans with a filter and the 220 nm ultraviolet lamps.
4. No device: a control group that receives no additional device ("standard of care"). Two classrooms within each school will be assigned as controls.
Why does this matter?: Clarifying the impact of low-cost practical solutions could support the adoption of these strategies that could reduce influenza and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission in schools in order to reduce the burden of respiratory illness in these communities.
