Infections caused by a new Covid variant are doubling in the US every week, raising concerns about a fresh wave of the virus.XBB.1.5 — another spinoff of the strain — was behind 40 percent of positive cases across America in the last week of 2022, up from 22 percent the previous week, according to the Centers for Disease Control and Prevention ().It has been dubbed the most antibody-resistant strain ever after acquiring mutations making it more infectious and better able to dodge antibodies from vaccines and past infections leading some experts to fear it could cause a new outbreak.
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