With five measles outbreaks ongoing in the US, lawmakers are questioning both health officials and tech giants on their efforts to combat the noxious anti-vaccine misinformation fueling the spread of disease.

Last week, Lamar Alexander (R-Tenn.), chairman of the Senate health committee, along with ranking member Patty Murray (D-Wash.) sent a letter to the Centers for Disease Control and Prevention and Health and Human Services. The lawmakers asked what health officials were doing to fight misinformation and help states dealing with outbreaks. "Many factors contribute to vaccine hesitancy, all of which demand attention from CDC and [HHS' National Vaccine Program Office]," the lawmakers wrote. On Thursday, February 14, the committee announced that it will hold a hearing on the subject on March 5.

Also Thursday, Rep. Adam Schiff (D-Calif.) sent letters to Google CEO Sundar Pichai and Facebook CEO Mark Zuckerberg. In them, Schiff expressed concern over the outbreaks as well as the tech companies' role in enabling the dissemination of medically inaccurate information.