The FLiRT variants, such as KP.2 and JN.1.7, are causing concern due to their ability to rapidly spread and evade immunity from previous infections and vaccines, leading the CDC to closely monitor them.
The KP.3 variant, a descendant of JN.1.11.1, is particularly alarming due to genetic mutations in the spike protein, resulting in a surge of Covid-19 cases, with California heavily impacted.
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