DES MOINES, Iowa (AP) — The discovery of bird flu on an Iowa turkey farm has raised serious concerns that the poultry-killing virus could find its way into chicken barns in the nation’s top egg-producing state and decimate flocks. Iowa is home to roughly 50 million chickens that lay nearly one in every five eggs consumed in the U.S.

The highly contagious H5N2 virus has not been detected in any Iowa chicken barns, but it was confirmed Tuesday on a northwest Iowa turkey farm. Iowa Poultry Association executive Randy Olson says farmers are on heightened alert, focusing on biosecurity measures to keep the virus away from chickens.

Procedures previously implemented to guard against salmonella help keep bird flu out, such as bird-proofed chicken houses to keep wild birds out and strict clothing-sanitation protocols.