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

The officer, Dr. Lakshmi Panagiotakopoulos, a pediatrician, was the CDC co-lead of the group of independent vaccine advisers that had spent months reviewing evidence for annual Covid-19 shots for Americans. They were drafting potential changes to narrow the agency’s recommendation for healthy children and adults under age 65, and had planned to vote on the changes at the group’s next meeting later this month.

“I am writing to let you know th

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