COVID’s New ‘FLiRT’ Variants—What To Know As Experts Fear Summer Surge

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Arianna Johnson is a reporter on the Forbes news desk who covers explainers and trends, with a frequent focus on health and science. She joined Forbes in 2022 and works in Texas. Johnson has covered prominent weight loss drugs like Ozempic and Wegovy, the health effects of the artificial sweetener aspartame and the impacts of the Covid vaccines.

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The new variants are descendants of the JN.1 variant, which is an offshoot of omicron and made of the majority of cases in the U.S. in December and earlier this year. FLiRT variants have two extra mutations on their spike proteins than JN.1 has, so some experts believe these mutations may make it easier for the variants to evade people’s immunity,

A FLiRT variant called KP.2 is the dominant variant in the U.S., making up 28.2% of cases in the two-week period ending in May 11, and KP.1.1—another FLiRT variant—made up over 7% of cases, according tothese variants may cause a spike in cases as people gather for several summer holidays, though U.S. cases and deaths havethan previous strains: Early data suggests KP.

 

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