A sign is seen at an AstraZeneca site in Macclesfield, central England April 28, 2014.
A general view shows the headquarter of Swiss drugmaker Roche in Basel July 21, 2008.
A health worker sprays disinfectant at a mosque in Bamako November 14, 2014.
Medical vehicles are seen at a health facility near the Liberia-Sierra Leone border in western Liberia, November 5, 2014.
U.S. President Barack Obama waves as he leaves Yangon Airport November 14, 2014.
Electronic cables are silhouetted next to the logo of Facebook in this September 23, 2014 illustration photo in Sarajevo.
A man uses a smartphone in New York City, in this picture taken November 6, 2013.
1 of 3. Dr. Martin Salia is placed on a stretcher upon his arrival at the Nebraska Medical Center Biocontainment Unit in Omaha, Nebraska, November 15, 2014.
