ST. PAUL — The nation’s poultry industry may have to live with a deadly bird flu strain for several years, which would be “devastating,” the U.S. Department of Agriculture’s chief veterinary officer said Thursday.

Dr. John Clifford also said that while new cases should drop to close to zero once the weather warms up and kills off the virus, there’s “very likely” to be a resurgence this fall when the wild waterfowl that are natural carriers of avian influenza fly south for the winter.

Clifford spoke on a visit to Minnesota, the state hit hardest by outbreaks that have led to the death of over 2.5 million turkeys and chickens in the Midwest since early March. He said the fact that the highly pathogenic H5N2 virus has already appeared as far east as southern Ontario means there’s an uncomfortable risk of it spreading to the East Coast where much of the U.S. broiler chicken industry is based.

“If it sticks around and continues it’s going to be very devastating to our poultry industry and our international markets, trade markets, as well as the loss domestically,” Clifford said.