evidence: The doctors wrongly used the number of COVID-19 positive cases in ER patients to extrapolate the prevalence rate of COVID-19 in the population. This caused sampling bias that overestimates the number of infections in the general population and consequently underestimates the COVID-19 mortality rate. Their claim that sheltering in place would lead to a weaker immune system due to less contact with microorganisms is also inaccurate, as even home environments are already seeded with trillions of microbes.