Nearly all the prisoners at Parnall Correctional Facility near Jackson have tested positive for antibodies for the coronavirus, suggesting that they had COVID-19 in the past. As of May 22, 92 percent of prisoners tested at Parnall were positive for antibodies, according to Chris Gautz, spokesman for the Michigan Department of Corrections. The department offered antibody blood tests to all prisoners at Parnall about two weeks ago. Of 1,248 people tested, Gautz said 1,148 were positive. Parnall emerged as a national hotspot for coronavirus cases in April, when the department was still limiting COVID-19 diagnostic testing to prisoners who were symptomatic.