Tape instructing members of the public to keep out marks the entrance to a farm where an outbreak of H7N7 avian flu was detected in the village of Goosnargh, near Preston, north west England on July 13, 2015. British authorities today confirmed an outbreak at a farm of a strain of avian flu that is both highly contagious and potentially deadly for birds, but said the risk to people was very low. AFP PHOTO / OLI SCARFF (Photo by OLI SCARFF / AFP)