(Reuters) -The U.S. on Wednesday authorized Pfizer Inc’s antiviral COVID-19 pill for at-risk people aged 12 and above, making it the first oral treatment and which can be taken at home, providing a potentially important tool in the fight against the fast-spreading Omicron variant. Pfizer’s antiviral regimen, Paxlovid, was nearly 90% effective in preventing hospitalizations and deaths in patients at high risk of severe illness, according to data from the company’s clinical trial. Recent lab data suggests the drug retains its effectiveness against Omicron, Pfizer said. Pfizer raised its 2022 pro…

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