Covid-19Regional Covid-19 TBDHU – Two Active Cases of COVID-19 in District By NNL Staff - July 13, 2021 1041 Thunder Bay – COVID-19 Update – Thunder Bay District Health Unit (TBDHU) is reporting 0 (zero) new COVID-19 cases in residents in the TBDHU Region. The current active cases is at 2. COVID-19 numbers have been dropping across Ontario as well.