the disease-induced herd immunity level for covid-19 is substantially larger than the classical herd immunity level
the disease-induced herd immunity level for covid-19 is substantially larger than the classical herd immunity level
the classical > herd immunity level $hc$ is defined as $hc=1-1/r0$, where $r0$ is the > basic reproduction number, for covid-19 estimated to lie somewhere in the > range 2.2-3.5 depending on country and region.", "it is shown here that the > disease-induced herd immunity level $hd$, after an outbreak has taken place > in a country/region with a set of preventive measures put in place, is > actually substantially smaller than $hc$.")