Bird flu has infected three more people from Washington state after they were exposed to poultry that tested positive for the virus, according to health authorities in Washington and in Oregon, where the human cases were identified.

Three individuals who had traveled to Oregon from Washington, where there have been nine total cases of HPAI, are being monitored by Washington health staff until 10 days following their last exposure.

U.S. health authorities recently reported a case of avian influenza, or bird flu, found in a pig on an Oregon farm, marking the first detection of this virus in swine within the country. This unusual transmission has raised concerns that bird flu could potentially become a public health risk for humans as well,