Bird flu or avian flu, is an infectious viral illness that spreads among birds. There have been some rare occasions where the illness has also affected humans. Bird flus do not infect humans easily and are rarely transmitted from human to human. However, several people have been infected around the world, leading to a number of deaths. Having flu-like symptoms is unlikely to indicate that you have bird flu - unless you have been in recent close with birds in an area where outbreaks have been reported.