Originally posted by aslyfox The IFR (infection fatality rate) seems to be more in the range of 0.4% (German data that tested 80% of the entire population of one town) to 0.5%-0.8% (a New York study which likely under-estimates due to biased sampling). Also, now we are learning that overall death rates have surged in conjuction with COVID-19, thousands have died at home, in nursing homes, etc. and never tested for COVID-19. Thus, the fatality side of the equation is worse than Iliff thinks.
Illiff estimates only 10 people would die in Shawnee County but apparently citizens over 55 don't count as people in his book. The 130 "aged units" (as President Reagan call them) culled from the population don't matter to Iliff but probably do matter to their friends, relatives, and community.
We also don't know the true percentage required for herd immunity maybe it's 60%, maybe it's higher. In fact, we don't even know if herd immunity works with COVID-19 or how long it lasts. We do know that viruses can mutate and that the greater the total virus population, the greater the chance that some mutation happens somewhere that lets the virus reinfect all those that had it (sparking another global pandemic!).
We also do know that if the infection rate gets high enough, the death rate surges. And we do know that without social distancing, the case rate doubling time of the virus makes it easy to exceed the allowable infection rate. We only get the lower IFR values that Iliff hopes for if the hospitals have capacity. But that requires social distancing. Ergo, Iliff's low death rate projections are incompatible with Iliff's economic reopening strategy.
TL;DNR: Iliff underestimates the death rate, recommends a strategy that will increase the death rate, and pins his hopes on an unproven "herd immunity" and the virus not mutating.