| XBB.1.5 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 Centers for Disease Control and Prevention. While there is no evidence so far that XBB.1.5 causes worse sickness than its predecessors, a recent swirl of misinformation linking the rise of new variants to vaccination has cast a spotlight on this latest strain and raised concern among some health experts that it could further limit booster uptake. | 
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