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    HomeExplainer-What are the FLiRT COVID variants and are they more contagious?FILE PHOTO: Picture illustration of vials with Pfizer-BioNTech and Moderna

    FILE PHOTO: Picture illustration of vials with Pfizer-BioNTech and Moderna

    FILE PHOTO: Vials with Pfizer-BioNTech and Moderna coronavirus disease (COVID-19) vaccine labels are seen in this illustration picture taken March 19, 2021. REUTERS/Dado Ruvic/Illustration/File Photo

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