The death toll from an outbreak of Legionnaires' disease in Quincy, Illinois, has risen to 10, all but one of them at a home for military veterans, public health officials said on Wednesday.

An additional 47 people have been sickened, most of them also at the Illinois Veterans' Home-Quincy, about 240 miles southwest of Chicago, according to a statement from the Illinois Department of Public Health. 

The 129-year-old home's age and sheer size complicates the scientific sleuthing by state and local public health workers and the federal Centers for Disease Control and Prevention. The 210-acre campus consists of dozens of buildings, both modern and aging, with residents spread among seven different locations, from independent living units to nursing homes with Alzheimer's wings. Those who died lived in several different buildings, said Rick Gengenbacher, the home's marketing director.

More details here.