The Washington Post @washingtonpost
XBB.1.5, pegged by the WHO as “the most transmissible” descendant yet of the omicron variant, rose from barely 2 percent of U.S. cases at the start of December to more than 27 percent the first week of January, according to new estimates by the CDC. https://t.co/10DwpHEXHh — PolitiTweet.org
