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Every year, public health inspectors at the Thunder Bay District Health Unit investigate over 200 suspected rabies cases. No cases have been found in domestic cats or dogs, but it has been found in wildlife in the area including foxes, bats and skunks. The virus can be passed to a human through a…

Smoking + Radon = Dangerous combination

Statistically, 1 in 20 people who have a high concentration of radon gas in their homes will develop lung cancer. However, if you smoke on top of this, your chances of developing lung cancer are 1 in 3. Don’t let the two leading causes of lung cancer stand…

The Thunder Bay District Health Unit provides information on a large number of infectious diseases. Diseases are listed from A-Z  below for your convenience.

Under the Child Care and Early Years Act, all children attending a licensed child care centre (daycare) must be immunized as required by the local Medical Officer of Health (MOH). The operator of the licensed facility has a legal obligation to make sure that all the children in their care are…



Mould in the corner of a room.


Mould is a health hazard. It is a type of fungus – or more accurately, a group of different kinds of fungi – that can grow in damp areas in public places and in your home. The Thunder Bay District Health Unit’s role is to:


Inspect public areas as necessary and…

Adverse Events Following Immunization

An adverse event following immunization (AEFI) is an unwanted or unexpected health outcome that happens after someone receives a vaccine, which may or may not be caused by the vaccine. Although rare, AEFI’s can occur. Potential AEFI side effects and management…

The Thunder Bay District Health Unit provides a variety of resources and services for health-care workers, educators and employers. In this section, you can access useful information about common public health topics such as communicable disease reporting, immunization, general health…

Bed bugs are insects with oval-shaped bodies and no wings. Unlike most public health pests, bed bugs are not known to transmit or spread disease. However, they are certainly a pest - feeding on blood, causing itchy bites and generally irritating their human hosts and they can cause other…

The environment affects our children more than it does adults for various reasons (read on below). The Thunder Bay District Health Unit’s role is to inform the public about these risks and provide information on how to reduce them. We want to help you ensure your children – and all children living…

Ammonia is a colourless gas with a very distinct odour. People may readily recognize this smell because it is used in many household cleaners and window cleaning products. High levels of airborne ammonia gas can dissolve in water to cause corrosive ammonium hydroxide. Most people smell ammonia…

Radon is an invisible, odourless radioactive gas that can be found in homes across Canada. It is produced naturally in the ground as uranium breaks down. The resulting gas can seep through cracks in the foundation, pipe openings, sump pits, and other openings into your home. Although it is present…

To ensure the efficacy of vaccines, the cold chain must be maintained according to Ontario's Vaccine Storage and Handling Guidelines (PDF).
Call 625-8810 or toll-free at 1-888-294-6630, ext. 8810 with questions.

expand_moreVaccine Transport


Temperature log books must be submitted with the…

Air quality has a direct impact on our health. Certain medical conditions including asthma, COPD and bronchitis can be triggered or worsened by poor air quality, resulting in lost activity days, hospitalization and in extreme cases death. There is also a growing awareness of radon, a naturally…

As of August 2024, the following organizations offer TB Skin Testing (TST). Please contact the facility regarding their hours of operation.

PLEASE CONTACT THE FACILITY REGARDING THEIR HOURS OF OPERATION AND THE COSTS ASSOCIATED WITH THIS TEST.

Open to the Public

The following table includes…

Publicly funded vaccines are available from TBDHU at no cost to eligible health care providers, if the facility meets specific criteria to ensure safe handling and storage of vaccines.
These criteria can be reviewed with TBDHU staff by calling 807-625-5900 in Thunder Bay, your local branch…