Executive summary: over one million people in the US would die and the medical system utterly collapse to get to herd immunity.
Here's Why Herd Immunity Won't Save Us From The COVID-19 Pandemic
Herd immunity is an epidemiological concept that describes the state where a population – usually of people – is sufficiently immune to a disease that the infection will not spread within that group.
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COVID-19 ...with an estimated R0 of roughly 3. With this number, the proportion of people who need to be infected is... sitting at around 70 percent of the entire population. ...If 70 percent of an entire population gets sick, that means that between 0.35-0.7 percent of everyone in a country could die, which is a catastrophic outcome. (that's over a million people dying taking the lower estimated number and rounding down)
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With something like 10 percent of all infections needing to be hospitalised, you'd also see an enormous number of people very sick...
Here's Why Herd Immunity Won't Save Us From The COVID-19 Pandemic
Herd immunity is an epidemiological concept that describes the state where a population – usually of people – is sufficiently immune to a disease that the infection will not spread within that group.
...
COVID-19 ...with an estimated R0 of roughly 3. With this number, the proportion of people who need to be infected is... sitting at around 70 percent of the entire population. ...If 70 percent of an entire population gets sick, that means that between 0.35-0.7 percent of everyone in a country could die, which is a catastrophic outcome. (that's over a million people dying taking the lower estimated number and rounding down)
...
With something like 10 percent of all infections needing to be hospitalised, you'd also see an enormous number of people very sick...