Once around 60% of the population is immune to a virus, epidemiologists speak of ‘Herd Immunity’ which is a state in which the virus spreads so slowly, that it no longer poses a public health risk. For SARS-CoV-2, it may take several months or even years to achieve natural herd immunity and even longer to obtain effective vaccination. However, there are a rising number of individuals who are already immune to the virus, oftentimes without even realizing it.