U.S. Surgeon General Vivek Murthy on Thursday called for a national effort to fight misinformation about COVID-19 and vaccines, urging tech companies, health care workers, journalists and everyday Americans to do more to address an “urgent threat” to public health. In a 22-page advisory, his first as President Joe Biden’s surgeon general, Murthy wrote that bogus claims have led people to reject vaccines and public health advice on masks and social distancing, undermining efforts to end the coronavirus pandemic and putting lives at risk.