Covid cases are continuing to recede in the U.S. - down 20 percent over the past week to 615,958 per day - but health officials warn that the next threat could be around the corner. The 'stealth' variant of , or BA.2 as it has been named, is a rapidly spreading Covid strain that has now been detected in dozens of countries and multiple U.S. states.The variant has received its stealth moniker due to how tricky it could be for scientists to detect it. BA.2 can not be confirmed via a PCR test, and instead required genetic sequencing. People infected with the new variant will still usually test positive for the virus on antigen or laboratory Covid tests, though. It has been detected in at least 40 nations, including the U.S. Eleven cases have been found in alone. It has rapidly spread across Europe in particular, quickly becoming the dominant Covid strain in Denmark and causing the plummeting of cases in the UK to stop - both countries were starting to look finished with Omicron before BA.2's detection.
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