Dr. Gupta on antibody testing: 'There's a lot of unknowns'

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UP NEXT
Study finds Covid infections linked to high cholesterol
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FDA could recommend yearly Covid booster
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CDC to utilize airplane sewage to track new Covid variants
02:04
Everything you need to know about a new Covid strain spreading across U.S.
03:24
Concerns over Covid spike in China grow ahead of Lunar New Year
03:30
China scraps quarantine requirement as it open the borders
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