> That's the "herd immunity" fraction for a disease with a growth rate of 3.
Only if you assume (1) perfectly homogeneous mixing and (2) nobody is naturally immune (either due to cross-reactivity with immune responses to other coronaviruses or for any other reason).
Only if you assume (1) perfectly homogeneous mixing and (2) nobody is naturally immune (either due to cross-reactivity with immune responses to other coronaviruses or for any other reason).