From NOVA PBS Official.
The number of people experiencing "long COVID" is unknown, but experts estimate that millions of Americans could be affected.
Could an out-of-order immune system be to blame for lingering symptoms?
Produced by: Emily Zendt
Production Assistance: Christina Monnen
Additional Footage: NAID, CDC/C.S.
Goldsmith and T.G. Ksiazek
© WGBH Educational Foundation 2021
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