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Delta vs. Omicron: CDC Director Discusses Coronavirus Variants
Omicron variant more transmissible than Delta -CDC director
Former Acting CDC Director Discusses Omicron And Covid Vaccines
CDC director talks concerns over omicron variant in US
CDC Director Dr. Rochelle Walensky on spread of the Delta variant, increase in COVID cases
CDC Chief On Omicron, Delta Killing Unvaccinated And Why Mask Rules Changed
Health officials discuss Omicron COVID variant | full video
CDC Director Dr. Rochelle Walensky Explains What to Know About New Delta Variant
Omicron is more transmissible than Delta variant: CDC Director
The AP Interview: CDC director on omicron variant
CDC Director: Delta variant dominates most U.S. COVID cases, but Omicron is rising rapidly #shorts
COVID-19 deaths rise 40%, likely from Delta says CDC Director