(Seattle, WA)  --  King County health officials say the outbreak of Legionnaires' disease at the University of Washington Medical Center in Seattle appears now to be contained.  Four people at the facility were sickened, including two who died.  UW Medicine officials began more than a week ago taking steps to prevent the spread of the disease, including installing filters and flushing water systems in the hospital's Cascade Tower, which is believed to be the source of the outbreak.