THE US Food and Drug Administration on Wednesday authorized the retooled Covid-19 booster shots of both Moderna and Pfizer/BioNTech that target the currently dominant BA.4/BA.5 Omicron subvariants of the coronavirus.Both vaccines also include the original version of the virus targeted by all the previous Covid shots as the country prepares for another vaccination campaign in the fall season.As a single dose, Moderna's vaccine is authorized for those aged 18 and above, while Pfizer's bivalent candidate is for those aged 12 and above.The US government has purchased 175 million doses of the booster shots in an effort to stave off the worst effects of a potential surge in new infections as schoo
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