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url = https://www.npr.org/tags/804916759/covid-19
covid-19 : npr
New COVID studies show promise for the Johnson & Johnson vaccine booster
Two studies that have not yet been peer reviewed indicate increased protection against the infectious omicron variant.
December 27, 2021 • People who test positive need to isolate themselves for 5 days if they don't show symptoms. The change reflects "what we know about the spread of the virus" and vaccine protection, the CDC chief says.