The omicron variant of Covid-19, which had been undetected in the US before the middle of this week, had been discovered in at least five states by the end of Thursday The omicron variant of COVID-19, which had been undetected in the US before the middle of this week, had been discovered in at least five states by the end of Thursday, showing yet again how mutations of the virus can circumnavigate the globe with speed and ease. Just a day after the first known US case was found in California, tests showed the omicron variant had infected at least five people in the New York City metropolitan area, plus a man from Minnesota who had attended an anime convention in Manhattan in late November. Officials reported another case in a Colorado woman who had recently travelled to southern Africa. The variant was also confirmed in an unvaccinated Hawaii resident with no recent travel history, state health officials said. Much remains unknown about the new variant, including whether it is mo...