A vaccine, or millions of deaths: How America can build herd immunity to the coronavirus – Washington Post

A vaccine, or millions of deaths: How America can build herd immunity to the coronavirus – Washington Post

One day, Alice gets sick.
This is Charlotte. She is healthy.
Although Alice is contagious, she cannot infect Charlotte because they do not spend any time together.
Enter Bob, a mutual friend.
Aliā€¦
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