The overall lethality of COVID-19 (infection fatality rate) is about 0.1% to 0.3% and thus in the range of a severe influenza; up to 60% of all persons may already have a certain cellular background immunity to the new coronavirus due to contact with previous coronaviruses (i.e. cold viruses); there is still little to no scientific evidence for the effectiveness of cloth face masks in healthy and asymptomatic individuals