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.

A top coronavirus vaccine adviser to the Centers for Disease Control and Prevention (CDC) resigned from the agency, citing concerns that she would no longer be able to help the most vulnerable people following a change in the agency’s recommendations for healthy children and pregnant women.