Covid-19Regional Covid-19 Thunder Bay District Health Unit Reports 5 Active Cases – One New Case Today By NetNewsLedger - August 10, 2021 1543 Thunder Bay – COVID-19 Update – The Thunder Bay District Health Unit (TBDHU) reports one new COVID-19 case in residents in the TBDHU Region. This brings the current active case number to 5. Today’s case is from travel outside of the region.