A new version of the Omicron coronavirus variant was designated on Tuesday that experts say will be harder to track because of its genetics. The new lineage, called BA.2, has been spotted seven times so far across South Africa, Australia, and Canada. BA.2 is genetically quite different from the original Omicron lineage, now called BA.1, which has been spreading across the world, said Francois Balloux, the director of the University College London Genetics Institute, per The Guardian. Crucially, it doesn't have the characteristic S-gene dropout mutation which allows Omicron BA.1 to be easily identified via PCR test results, the main...