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New, highly transmissible COVID-19 strain fueling wave of infections across US

Just in time for respiratory virus season, a highly transmissible COVID-19 strain is fueling a wave of infections across the US. The XFG variant, informally known as “Stratus,” has been driving up case numbers. Stratus’ ability to evade immune system defenses has propelled it past NB.1.8.1 (aka “Nimbus”) as the…