Seven days in medicine: 3-9 February 2021

Abstract

Around a quarter of people with evidence of past covid-19 infection were completely asymptomatic, a UK study found, while 40% did not have any of the three classic symptomsof fever, persistent dry cough, or loss of taste or smell. The UK Biobank SARS-CoV-2 Serology study analysed monthly blood samples of nearly 19 000people from27May to 4December 2020. Some 99% of participants who tested positive for previous infection retained antibodies for three months after being infected, and 88% did so for at least six months. (Full story doi:10.1136/bmj.n321)