The Senate Appropriations Committee holds a 2 p.m. hearing Wednesday on the U.S. response to the Ebola virus, which has killed more than 4,900 people since the outbreak began in December 2013 . Dr. Thomas R. Frieden, director of the Centers for Disease Control and Prevention, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, and Sylvia Mathews Burwell, secretary of Health and Human Services, will testify. Additional witnesses include officials from the Departments of Homeland Security, Defense and State and USAID. Roll Call Results Map: Results and District Profiles for Every Seat Get breaking news alerts and more from Roll Call in your inbox or on your iPhone.