Bird Flu Spreading in Europe and Asia, Humans Found Infected As Well

An H7N9 bird flu patient walks in the corridor of a hospital in Bozhou City, in central China's Anhui Province on April 19, 2013. A recent Chinese Communist Party internal investigation has found rampant corruption within the province's medical system. STR/AFP/Getty Images

The World Organization for Animal Health (OIE) has received multiple reports from countries in Asia and Europe regarding a recent spread of bird flu, giving rise to concerns that the virus may be spreading again.

Bird flu, or avian influenza, is a viral disease that affects both domestic and wild birds. The virus has also been isolated from mammals including dogs, cats, mice, horses and humans. Certain strains are more prevalent in specific regions of the world.