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As Vaccine Rolls Out, COVID-19 Variants Raise New Concerns | TODAY
U.S. races to roll out COVID-19 vaccine as concerns grow over new variants
Covid-19: Vaccine Roll-out, the State of the Pandemic, and Variants – in the U.S. and U.K.
Vaccine Will Be Effective Against New Strain Of COVID-19, Doctor Says | TODAY
Coronavirus: Variant concern as vaccine continues to be rolled out
Top Pfizer scientist discusses COVID-19 vaccine's efficacy and new variants
U.S. to start rolling out updated COVID vaccine
Do Vaccine Booster Shots Protect Against Covid Variants? What Research Shows So Far
India variant increases in UK
New concerns raised over South African variant of COVID-19
Vaccine Disparities Raise Alarm as Covid Variants Multiply
U.S. works to get more COVID-19 vaccine doses amid concerns over new variant
