I think a good way to illustrate the math wrt to the "flattening the curve" is talking about hospitalizations. If 50% of America gets covid19, an average of about 20% will require a hospital stay, (330M×.5×.2) so about 33M. In 2018, the CDC said there was about 7.9% of Americans who required a hospital stay, (330×.079) so about 26M. There's probably some overlap of people who would've required hospital treatment but you can see this conservative estimate shows hospitals will likely have over double the normal patients this year.
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