"The dangers of misinformation and its promulgation has now led to deadly consequences," she wrote. "I will work to restore trust in public health to those who have lost it -- through science, evidence and clarity of purpose.

Following the deadly shooting outside the CDC headquarters in Atlanta on Friday, some workers are now calling for better protections. One police officer was killed when a gunman with anti-vaccine views opened fire.

On Friday, a gunman fired more than 180 rounds at the Centers for Disease Control and Prevention buildings in Atlanta. That has left staff scared, as well as frustrated by the U.S. Department of Health & Human Services' response.