‘Stealthy’ Omicron Version Can Slip by Tests

A version of the Omicron variant, capable of slinking under the radar among positive PCR tests, could complicate tracking efforts.
The clandestine version, found in recent coronavirus genomes from South Africa, Australia and Canada, still shows up as a coronavirus in tests—but it lacks a particular genetic change relied on to flag Omicron cases in PCR tests.
Genomic testing can still identify the sneaky version, but the results aren’t as fast.
Despite sharing many mutations with “regular” Omicron, the new version is genetically distinct, and it’s too soon to tell whether it will behave differently.
The Guardian

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