Interesting read regarding the spread and severity of the virus in US prisons.
In four U.S. state prisons, nearly 3,300 inmates test positive for coronavirus -- 96% without symptoms - Reuters
Notably "Marion Correctional Institution, which houses 2,500 prisoners in north central Ohio, many of them older with pre-existing health conditions. After testing 2,300 inmates for the coronavirus, they were shocked. Of the 2,028 who tested positive, close to 95% had no symptoms."