What Is the Omicron Subvariant XBB.1.5?
variant that’s suddenly causing a wave of infections in the U.S. XBB.1.5 has more than doubled the amount of COVID-19 cases it caused each week for the last four weeks, shooting up from causing 4% to 41% of new infections in December, according to the Centers for Disease Control and Prevention’sXBB.1.5 seemingly came out of nowhere, snatching the title of the most common COVID-19 subvariant in the U.S. from BA.5, BQ.1, and BQ.1.
“It has become more dominant and even has further evolved to become more transmissible,” Dr. Adalja says, noting that it’s shown up more often in places like Singapore and the Northeastern U.S.Experts agree that XBB.1.5 is very contagious—and possibly the most contagious form of COVID-19 yet. “It’s outcompeting the other variants at a fast pace and that’s resulting in widespread spread right now,” says William Schaffner, M.D.
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