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Previous reports have observed about 18%, with a person in Japan obtaining 30% (it has to be reported the unique estimate of 500,000 assumed zero innate immunity, which is also possible incorrect). To lessen the first approximated death toll of 500,000 to 50,000, you need to have an innate immunity fee of 90%. One of the reports in the connected paper increased the seroprevalence from 6% to 11%. This is not enough to make a significant variation to the dying fee. I agree that if a sizeable proportion of the population have "innate immunity" it lowers the top death toll and the IFR. There is tiny proof that a vast majority of the populace have innate immunity. Nothing I have go through but would make it crystal clear that these types of immunity exists and persists for COVID-19 even though many researchers are looking for proof one particular way or the other and hearth the period of any these types of immunity. If there is not expanding immunity, hopefully from a vaccine, if an efficient one is generated (a probability fairly than a certainty), isolation is the only way that unfold of the virus has been and can proceed to be contained.