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U.S. works to get more COVID-19 vaccine doses amid concerns over new variant
New vaccines show promise amid concerns over coronavirus variants
Doctors Urge People to Get COVID-19 Vaccine, Booster Amid Omicron Uncertainty
COVID-19 Cases Drop Amid New Concerns About Variant Strains | TODAY
U.S. vaccination sites working overtime amid emergence of coronavirus variants
Coronavirus crisis: Vaccine rollout grows amid travel ban and variant concerns
South America Leads Vaccination Rate Numbers Amid Efficacy Concerns
NIH director on the spread of the omicron variant amid the ongoing pandemic
U.S. health experts warn of more contagious Delta variant amid push to get people vaccinated
U.S. races to roll out COVID-19 vaccine as concerns grow over new variants
COVID-19: UK to offer booster vaccine to all adults 18+ amid concerns over Omicron
Vaccine rollout gains speed as threat grows from COVID variants
