On December 30, 2022, US Eastern Time, the US Centers for Disease Control and Prevention released data showing that it is estimated that 40.5% of the new coronavirus infection cases in the US that week were caused by the highly contagious Omecro subtype XBB.1.5 strain. There is no indication that XBB.1.5 causes more severe disease than other omecron variants, said Barbara Barbara, director of the division of respiratory viruses at the U.S. Centers for Disease Control and Prevention. While COV...