Rick Bright, deputy assistant secretary for preparedness and response for Health and Human Services (HHS), listens during a House Oversight and Investigations Subcommittee hearing in Washington, D.C., U.S., on Thursday, March 8, 2018. The committee is looking for answers on how to improve preparedness during this year's particularly severe flu season and the effectiveness of vaccines. (Toya Sarno Jordan/Bloomberg/Getty Images)
Director of key vaccine agency says his dismissal was retaliation
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