The confusing issue here is the dispersion factor: the variability between infectiousness of carriers, which appears to be quite high in the case of covid-19:

The confusing issue here is the dispersion factor: the variability between infectiousness of carriers, which appears to be quite high in the case of covid-19: https://www.sciencemag.org/news/2020/05/why-do-some-covid-19-patients-infect-many-others-whereas-most-don-t-spread-virus-all# https://www.sciencemag.org/news/2020/05/why-do-some-covid-19...