Health unit announces five new COVID-19 cases Thunder Bay District Health Unit announces new cases at jail, correctional centre, and a district First Nation Jan 31, 2021 9:37 AM By: TbNewsWatch.com Staff THUNDER BAY – The Thunder Bay District Health Unit reported five new confirmed cases of COVID-19 Sunday. The number of active cases in the district dropped by two, to 143, thanks to seven newly resolved cases. That figure has dropped significantly since hitting an all-time high of 186 active cases on Friday. Four of the cases announced Sunday involve individuals in the Thunder Bay area: three were associated with an outbreak at the Thunder Bay District Jail, and another with an outbreak at the Thunder Bay Correctional Centre.