Surgeon general issues warning over vaccine misinformation as White House turns up the heat on Facebook

US Surgeon General Dr. Vivek Murthy warned Thursday health misinformation is "a serious threat to public health," as administration officials grow increasingly concerned about misleading claims about coronavirus vaccines, leading to a confrontation with social media giant Facebook. "I am urging all Americans to help slow the spread of health misinformation during the COVID-19 pandemic and beyond," Murthy wrote in a 22-page advisory released Thursday. "Health misinformation is a serious threat to public health. It can cause confusion, sow mistrust, harm people's health, and undermine public health efforts. Limiting the spread of health misinformation is a moral and civic imperative that will require a whole-of-society effort."