Omicron
Booster
the Pfizer-BioNTech and Moderna
the US Centers for Disease Control and Prevention
CDC
the Centers for Disease Control and Prevention
The Journal of the American Medical Association
US.Three
White House
India
Al Jazeera
Emma Accorsi
Rochelle Walensky
Healthcare
English
Delta
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US
Germany
South Africa
the United Kingdom
Pfizer
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