FRANKFORT, Ky. – State Veterinarian Robert Stout says an outbreak of bird flu on a western Kentucky chicken farm did not spread to nearby backyard poultry flocks.

Stout said animal health workers tested flocks within a 2-mile radius of the Brownsville chicken farm for signs of the “non-pathogenic or low-pathogenic” strain of avian influenza. He said Thursday no additional cases were found in initial tests, and additional tests are pending.

The state is developing plans to expand the testing radius for backyard flocks to more than 6 miles.

The Kentucky Department for Public Health said there is no evidence the disease has been transmitted from birds to humans.