The SARS-CoV-2 transmission riddle - Part 11

Attribution of causality in the transmission of respiratory viruses

The role of asymptomatic and pre-symptomatic individuals in the covid pandemic has been unclear. This is understandable: a newly identified agent, few or no symptoms and the ages-old fear of those who creep up silently and infect you. Alessandro Manzoni consecrated the role of the “untore” or anointer in his great canvas of the 1628 plague in Milan. At …