Respiratory virus season may be ending in the United States, but a new group of
surge? What are the symptoms of the FLiRT variants? Are vaccines still effective? We spoke to experts to learn more. What are the FLIRT variants? The FLiRT variants — KP.2 and KP.1.1 — are spinoffs of JN.1.11.1, a direct descendant of JN.1, and were initially detected in wastewater samples from across the country. The new variants have two additional mutations that set them apart from JN.1 and appear to give them an advantage over previous variants, Dr.
is currently “minimal” — it was considered high or very high for most of January and February. 'It seems like transmission is pretty low right now, and that makes sense because usually the big peaks are in the winter, when people are inside and in more contact,' says Ko. is something scientists are still trying to understand. But one thing is obvious: “This virus is now integrating itself into our population and our way of life,” says Schaffner. There are several reassuring factors, says Ko. First, KP.2 is not a highly divergent variant — in other words, it doesn't have a very large number of new mutations that differentiate it from other strains. Second, many people have immunity from recently being infected with the FLiRT variant predecessor JN.1.
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