New COVID-19 subvariant is spreading across the U.S. and could get worse

A highly-mutated COVID-19 subvariant is spreading in the U.S. There's concerns about a possible summer wave of cases of the "Cicada" subvariant. For a closer look, KCBS' Margie Shafer spoke with Dr. Chin-Hong, Professor of Medicine and infectious disease expert at UCSF School of Medicine. Getty Images / Joe Raedle / Staff