Previous health care provider updates can be found here


COVID-19 Updated Guidance


Updated Testing Requirements

On January 13, the Ministry of Health updated the COVID-19 Integrated Testing & Case, Contact and Outbreak Management Interim Guidance.

Some notable changes include:
  • eligibility criteria of those prioritized for molecular testing has been expanded to include (in addition to those already eligible): patient-facing health care workers, symptomatic pregnant people, first responders (including fire, police, and paramedics), people who are underhoused or homeless, and household members of workers in highest risk settings (pg 3-4).
  • PCR confirmatory testing is no longer required in any setting after a positive RAT.
  • List of highest risk settings has been updated and now includes: hospitals (including complex continuing care facilities and paramedic services) and congregate living settings, including Long-Term Care, retirement homes, First Nation elder care lodges, group homes, shelters, hospices, and correctional institutions.
    • Note that First Nation and Metis communities are no longer included in the definition of highest risk settings.
  • Severely immunocompromised and individuals receiving ICU level care will need to isolate for 20 days
  • Isolation guidance has changed to isolating from symptom onset or date of specimen collection, whichever is earlier


4th Doses (Boosters) for Immunocompromised

Eligibility: The Ministry has released guidance for eligibility and administration of 4th doses of COVID-19 vaccine. Moderately to severely immunocompromised individuals who are eligible for a three-dose primary series are now recommended to receive a booster dose (i.e. 4th dose) ≥3 months (84 days) after completion of the extended primary series. Please note that eligibility begins at 5 years of age or older for a third dose 56 days after the second dose. Only individuals 18+ are eligible for a fourth dose booster 84 days after their third dose. Please also note that a full dose of Moderna (0.5mL/100mcg) is recommended for all eligible immunocompromised individuals regardless of age. A booster dose of Pfizer is recommended for those 12-29 years of age.

For details on eligibility and more, see the COVID-19 Vaccine Third Dose Recommendations.

Appointments: In Thunder Bay: TBDHU will be offering 4th doses at the CLE Mass Immunization Clinic. Individuals can walk-in or book an appointment by calling the Provincial Call Center (no online booking).  In the District, patients should call their local health unit branch office to identify themselves and to coordinate an appointment or book with a local pharmacy. They can also book by calling the Provincial Call Center (no online booking).

If visiting a TBDHU clinic or pharmacy, patients must show proof of eligibility. This can include any of the following:
  • A completed TBDHU referral form from their physician/specialist
    • NOTE: The updated 3rd dose referral form, which now includes eligibility for 4th doses, will be emailed to all clinics and health care providers who received one previously. If you do not receive an email by January 19, please email Robin Cooper at
  • A copy of the referral form they used as proof of eligibility for their third dose.
  • A letter/document from their health care provider, hospital or clinic that clearly outlines their eligibility for the booster (4th) dose and includes the person’s name as well as the contact information for the clinic
  • A prescription or medication bottles from the list found in the guidance document or on our website
Individuals eligible for a 4th dose through their living situation (e.g. Long-Term Care, Assisted Living, Retirement Home) will be vaccinated through their home.


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Thunder Bay District Health Unit · 999 Balmoral Street · Thunder Bay, On P7B 6E7 · Canada