State agriculture officials are ramping up efforts to protect North Carolina's poultry industry against the avian flu.
The bird flu, called H5N2, is not a danger to humans, but has devastated poultry flocks in 21 states. Since its first appearance in December 2014 in British Columbia, the virus has killed nearly 50 million birds. The disease is spread by wild water fowl as they migrate across the continent.
North Carolina is still free of the bird flu, but Agriculture Commissioner Steve Troxler said that may change as wild birds begin their migration south in the fall.