WASHINGTON — Health Secretary Robert F. Kennedy Jr. heads to Capitol Hill for testimony Thursday, a week after Centers for Disease Control and Prevention Director Susan Monarez was fired and a series of vaccine-related decisions drew criticism from lawmakers, including Senate health committee chair, Sen. Bill Cassidy, R-La. Monarez’s firing led several senior CDC officials to resign and fueled a staff protest outside the agency’s Atlanta headquarters last week. In a scathing editorial in The New York Times on Monday

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