5 things we still don't know about COVID-19

Gabrielle Masson - Print  | 

Scientists have already learned an extraordinary amount about COVID-19 in the one year since its emergence, but there's still a lot we don't know.

"In terms of understanding anything in any real detail, we've got miles and miles to go," Maureen Ferran, PhD, an associate professor of biology at Rochester (N.Y.) Institute of Technology, told CNN. "This is going to keep virologists and public health officials busy for decades."

Below are five questions about COVID-19 that the world still doesn't have the answers to: 

What is the origin of the virus?

Why does it affect some people more than others?

How is the virus spread?

How long is someone who survived COVID-19 immune to the virus?

When will the pandemic be over? 

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Number of COVID-19 hospitalizations, state by state
US flu activity still unusually low: 6 notes from CDC's FluView report
Number of people willing to get COVID-19 vaccine rising, surveys find


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