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Doctor on COVID-19 variants spreading rapidly in U.S.
'Matter of time' before omicron is the dominant strain in US: Medical expert
Coronavirus variant spreading rapidly among unvaccinated
COVID-19 Omicron subvariant rapidly spreads across the U.S.
New COVID-19 variant spreading rapidly in New York City | WNT
Does your COVID-19 immunity work against variants?
Doctor on spread of highly contagious COVID-19 variant in U.S.
Dr. Scott Gottlieb: Vaccinated people are less likely to spread Delta variant
Dr. Scott Gottlieb on spread of delta variant of Covid around the world
Drugmakers developing booster shots to target COVID-19 variants
Delta COVID-19 cases surge, omicron variant spreading rapidly ahead holidays | WNT
Coronavirus Update 123: COVID 19 Vaccines vs. Variants
