The COVID-19 riddle: Why some countries are spared and others not 

The World

Siddhartha Mukherjee, an Indian American oncologist, and author set out to understand why the coronavirus pandemic seems to be hitting some countries so much harder than others. Mukherjee talks with The World’s Marco Werman about intriguing new scientific theories, including the possibility that certain populations might have some prior immunity to COVID-19.

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