Which epidemics? Previous flu pandemics reached the levels of infection predicted by SIR. Measles reached that level in isolated populations without immunity from prior infections. There is no prior immunity from past infection for a novel disease so everyone is vulnerable.
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Where is the calculation that would justify that second statement -- i.e., a calculation of CFR or IFR based on a denominator that falsely includes low-susceptibility individuals who don't get infected? Can you point me to one?
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On the first paragraph, what is the justification for that assumption? What does "it's a novel zoonotic" have to do with it? It is a coronavirus, correct? Coronaviruses are common, correct? Neutralizing antibodies and cytotoxic T-cells raised by coronaviruses are common, correct?
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The assumption is that people are not immune to novel infectious agents. The spread of COVID19 is not consistent with any other assumption; certainly not with the assumption that having had a coronavirus cold will make you immune.
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