Bird flu has possibly infected four agricultural workers in Washington state, according to the Washington State Department of Health. In a press release Sunday, the Washington State Department of Health said the “workers tested presumptively positive for avian influenza after working with infected poultry at a commercial egg farm in Franklin County.

The number of workers at a Franklin County commercial egg farm who have now tested positive for avian influenza has increased to eight, according to preliminary test results.

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 number of people infected with bird flu in the U.S. has risen to at least 31, federal health officials said Thursday, but there is no evidence of human-to-human spread after blood tests confirmed health workers in Missouri caring for a hospitalized patient were not infected.

Four farm workers who helped cull poultry on a commercial egg farm in Washington are suspected of having been infected with bird flu, making that state the sixth in the country to report human H5N1 infections this year.

There is no evidence of human-to-human transmission of bird flu in the case of the Missouri patient with no known infected animal contact, according to the CDC.

The Centers for Disease Control & Prevention confirmed two human cases of avian influenza in Washington on Thursday following an outbreak on a commercial poultry farm.

The CDC is deploying a team to Washington state to assess the health of farm workers who culled poultry suffering from bird flu after four workers are presumed to have been infected by the virus, U.S.

A second person in Missouri who wasn't exposed to either poultry or dairy cows has been infected with bird flu, U.S. health officials