U.S. Surgeon General Vivek Murthy is urging technology companies, health care workers and everyday Americans to do more to stop the spread of misinformation about COVID-19 and vaccines. In his first advisory as President Joe Biden’s surgeon general, Murthy on Thursday called misinformation about health matters a “serious public threat” demanding a country-wide response. Bogus claims about coronavirus vaccines have led some people to reject masks, social distancing and immunizations, worsening the pandemic. Murthy urges tech companies to reduce the spread of such claims but says everyone has a role to play in fighting what the World Health Organization calls an “infodemic” of health misinformation.