The scientist, Dr. Fiona Havers, told colleagues at the Centers for Disease Control and Prevention on Monday that she no longer had confidence that the COVID and RSV data would be used "objectively or evaluated with appropriate scientific rigor to make evidence-based vaccine policy decisions," according to an email seen by Reuters.

A medical officer at the US Centers for Disease Control and Prevention who was working on the committee that was weighing changes to the agency’s Covid-19 vaccine recommendations resigned on Friday, the same day officials the US Department of Health and Human Services announced they had removed the CDC recommendation for pregnant women and healthy children to get Covid-19 vaccines.