Infect Control Hosp Epidemiol. 2020 Aug 26:1-9. doi: 10.1017/ice.2020.441. Online ahead of print.
In one week, 7,5% (9 in 120) asymptomatic inpatients were diagnosed with COVID-19 at a hospital with universal face masks policy. Median length of stay was 11 days, suggesting nosocomial infections. Most were presymptomatic with median cycle threshold value of 22, indicating high viral loads.