Coronavirus has been with us for a year. Here's what we still don't know

When China first reported cases of coronavirus to the World Health Organization on December 31, 2019, it was described as a mysterious new strain of pneumonia. It didn't even have a name.

from CNN.com - RSS Channel - App International Edition https://www.cnn.com/2020/12/28/health/coronavirus-unknown-facts-intl-hnk-dst/index.html
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