Federal health authorities have confirmed at least two people in Washington have contracted bird flu after working around poultry with the virus at a commercial egg farm in Franklin County. State and local health officials on Sunday revealed four people in Washington were “presumptively” positive for the illness,

The U.S. Centers for Disease Control and Prevention on Thursday confirmed two of the four presumptive positive bird flu cases among poultry farm workers in Washington state. The agency also ruled out bird flu infections among healthcare workers who tended to a person who contracted the virus in Missouri,