First presumed human infections of avian influenza under investigation in Washington state Washington State Department of HealthFour test positive in WA’s first human bird flu infections The Seattle Times4 agricultural workers test ‘presumptively positive’ for avian flu, first cases in WA KOMO NewsPresumed human infections with avian influenza under investigation in Washington OregonLiveNearly 2 million chickens must be killed in Utah after major flock tests positive for the flu Salt Lake Tribune