tag:www.gov.uk,2005:/data-access-approvals-register Find out who is approved to access UKHSA data for research and other secondary uses data set Health Protection Case and Incident Management System (HPZone) 2025-08-04T11:59:51+01:00 HM Government tag:www.gov.uk,2005:/data-access-approvals-register/2546-a-cluster-randomised-controlled-trial-of-air-filtration-to-prevent-symptomatic-winter-respiratory-infections-including-covid-19-in-care-homes-afri-c 2025-08-04T11:59:51+01:00 2546: A cluster randomised controlled trial of Air Filtration to prevent symptomatic winter Respiratory Infections (including COVID-19) in care homes (AFRI-c) This study aims to find out if air filters can reduce winter respiratory infections (including COVID-19) in care home residents.