Slovakia has reported an outbreak of avian influenza on a poultry farm, the World Organisation for Animal Health (WOAH) said on Tuesday, as Europe faces a seasonal upturn in the deadly disease commonly known as bird flu.

Bird flu viruses are divided into two categories: low pathogenic avian influenza (LPAI) and highly pathogenic avian influenza (HPAI). H5N1 is an HPAI that causes severe illness an

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

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.

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

The Washington State Department of Health is investigating after four agricultural workers tested presumptively positive for the first human infections of bird flu.

Bird flu is presumed to have infected four poultry workers in Washington state, making it the sixth U.S. state to identify human cases this year, according to the Washington State Department of Health.