• U.S. Secretary of State John Kerry (R) listens as African Union Commission Chairperson Nkosazana Dlamini Zuma (L) delivers remarks during the opening of the African Union Commission High Level Dialogue April 13, 2015 at the State Department in Washington, DC.

    The U.S. has signed an agreement to help the continent form a center for disease control.

    LAST UPDATE : Apr 13, 2015, 4:52 PM EDT
  • Sierra Leone health officials check passengers transiting at the border crossing with Liberia in Jendema on March 28, 2015.

    West Africa is still struggling, but the W.H.O. has said that other countries are at less of a risk of the virus.

    LAST UPDATE : Apr 10, 2015, 3:01 PM EDT
  •  In this Nov. 2, 2005 file photo, turkeys are pictured at a turkey farm near Sauk Centre , Minn.

    Infection of sixth turkey flock hits Minnesota, nation's top turkey-producing state, in less than a week.

    LAST UPDATE : Apr 09, 2015, 7:34 AM EDT