WASHINGTON, DC - FEBRUARY 10: Director of the Centers for Disease Control and Prevention's National Center for Immunization and Respiratory Diseases Anne Schuchat testifies during a hearing before Senate Health, Education, Labor and Pensions Committee February 10, 2015 on Capitol Hill in Washington, DC. The committee held a hearing on "The Reemergence of Vaccine-Preventable Diseases: Exploring the Public Health Successes and Challenges." (Photo by Alex Wong/Getty Images)
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