The Washington PostThe Washington Post

Five things about Covid we still don't understand at our peril

By Mark Johnson

26 Sep 2022 · 10 min read

Editor's Note

As we rapidly approach three years of the Covid pandemic, there are still many big questions unanswered. This Post article attempts to address some of the coronavirus' biggest secrets.

Since a new coronavirus launched the global pandemic that has now killed more than 6.5 million people - 16 percent of them in the United States alone - scientists in record numbers have devoted themselves full time to unraveling its mysteries.

In less than three years, researchers have published more than 200,000 studies about the virus and covid-19. That is four times the number of scientific papers written on influenza in the past century and more than 10 times the number written on measles.

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