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 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.

Four agricultural workers in Washington state have tested positive for bird flu, the first human cases of H5N1 virus to be reported in the state. Washington is the sixth state to report a human infection of avian flu.