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.

Bird flu cases are steadily increasing in states around the country, as concerns about it spreading further grow. This week, Washington reported reported its first cases of avian influenza. Four agriculture workers tested presumptively positive after ...

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.