Four agricultural workers tested “presumptively positive” for avian influenza, or bird flu, after working with infected poultry at a commercial egg farm in Franklin County, according to the Washington State Department of Health.

Four agricultural workers at a commercial egg farm have tested presumptively positive for avian influenza, commonly known as bird flu.

Washington state health officials said four agricultural workers tested presumptively positive for avian influenza, marking the first presumed human cases in the state.