Covid-19Regional Covid-19 April 12, 2020 – TBDHU Reports Seven New Positive Tests for COVID-19 By NetNewsLedger - April 12, 2020 6122 Dr. Janet De Mille THUNDER BAY – There are more positive tests for COVID-19 in Thunder Bay. On April 12, 2020, the Thunder Bay District Health Unit reported details on seven new positive test. There are now thirty-three positive tests for COVID-19 in Thunder Bay.