Doctor Bill Smith, a local physician, said he and other experts are worried about XBB's ability to avoid antibodies of vaccines and boosters. More stories, here: https://www.wbir.com/ Subscribe to WBIR for exclusive content: https://www.youtube.com/c/WBIR10 WBIR Channel 10 in Knoxville, Tennessee produces award-winning, community-centered content "Straight From The Heart" of East Tennessee. We strive to be good citizens, to do what is right, and to be fair and honest. We care. Follow WBIR on Social: Facebook: https://www.facebook.com/WBIRChannel10 Twitter: https://twitter.com/wbir Instagram: https://www.instagram.com/wbirchannel10/