U.S. Rep. Adam Schiff (D-Burbank), sent a letter to Sundar Pichai and Mark Zuckerberg, the CEOs of Google and Facebook, respectively, to express concern that the company’s platforms including YouTube, Facebook and Instagram, are surfacing and recommending information that discourages parents from vaccinating their children, contributing to declining vaccination rates which could reverse progress made in tackling vaccine-preventable diseases.

“As a member of Congress who is deeply concerned about declining vaccination rates, I am requesting additional information on the steps that you currently take to provide medically accurate information on vaccinations to your users, and to encourage you to consider additional steps you can take to address this growing problem,” Schiff wrote in the letter.

The scientific and medical communities are in overwhelming consensus that vaccines are both effective and safe. There is no evidence to suggest that vaccines cause life-threatening or disabling diseases, and the dissemination of unfounded and debunked theories about the dangers of vaccinations pose a great risk to public health.