Confidential data shows many Illinois coronavirus outbreaks have been undisclosed: report

Outbreaks of coronavirus in schools, workplaces and other facilities are driving the surge of new COVID-19 cases in Illinois, some of which have not been publicly identified, according to a new study.
The study from journalists at the Brown Institute for Media Innovation and the Midwest Center for Investigative Reporting published in USA Today indicates that individual clusters of coronavirus infections are primarily responsible for the latest wave of new COVID-19 cases vexing public health officials in the state, with several outbreaks occurring at correctional facilities and a major military base.
The second-largest outbreak identified by the study, which until now has not been reported to news organizations, is occurring at the Great Lakes Naval Base in Lake County, Ill., where 228 new cases of COVID-19 have been identified over the past month according to confidential data recorded by Illinois officials and obtained by the study.
The number of cases