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The founder of the Red Cross movement in Canada was George Sterling Ryerson. He used a makeshift red cross to protect his horse-drawn ambulance during the North-West Resistance.

The Commission of Inquiry on the Blood System in Canada, also known as the Krever Inquiry, was a public investigation of the Canadian blood system, which had been contaminated with the human immunodeficiency virus (HIV) and hepatitis C virus during the 1980s. (See also Aids.) In 1993, a public inquiry into the Canadian blood system was established and Justice Horace Krever was named commissioner. The infection of thousands of Canadians with (HIV) and hepatitis C is Canada's worst- ever preventable public health disaster. It has also become one of its most prolonged legal sagas, featuring a high-profile public inquiry, almost $10 billion in legal claims and a criminal investigation.

Maude Elizabeth Seymour Abbott, cardiac pathologist, physician, curator (born 18 March 1868 in St. Andrews East, QC; died 2 September 1940 in Montreal, QC). Maude Abbott is known as the author of The Atlas of Congenital Cardiac Disease (1936), a groundbreaking text in cardiac research. Though Abbott graduated in arts from McGill University (1890), she was barred from studying medicine at McGill because of her gender. Instead, she attended Bishop’s College (now Bishop’s University), earning a medical degree in 1894. As assistant curator of the McGill Medical Museum (1898), and curator (1901), she revolutionized the teaching of pathology by using the museum as an instructional tool. Abbott’s work paved the way for women in medicine and laid the foundation for modern heart surgery. (See also Women in STEM).

An epidemic occurs when an infectious disease spreads rapidly throughout a community at a particular time. Several epidemics have occurred over the course of Canadian history, the most disastrous being those which affected Indigenous peoples following the arrival of Europeans.

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Birth control means the deliberate prevention of conception and pregnancy. The birth control methods used in Canada range from the simplest (like abstinence) to the most complex (like male or female surgical sterilization). (See also History of Birth Control in Canada.)

Vaccination is the introduction of a vaccine into the body to produce immunity to a disease. Vaccine hesitancy is the refusal or delayed acceptance of vaccination due to fears or anxiety about vaccines. It includes a range of concerns such as uncertainty about vaccines’ contents and their safety and the belief that vaccines are responsible for causing other medical conditions (e.g., autism). Other factors include opposition to state control and infringement on individual liberty, suspicions about the pharmaceutical industry and a declining faith in science and medicine. In Canada, as in other wealthy countries, vaccine hesitancy has increased in recent years.

The Armand-Frappier Santé Biotechnologie Research Centre, is part of the Institut national de la recherche scientifique (INRS). It is an important centre for research, training and technology transfer (see Medical Education).

Canada experienced an outbreak of severe acute respiratory syndrome (SARS) in 2003. Most of the infections originated in Toronto hospitals. The outbreak led to the quarantine of thousands, killed 44 people and took an economic toll on Toronto. It also exposed the country’s ill-prepared health-care system. Confusion around SARS fuelled an uptick in  anti-Asian racism and anti-immigrant sentiment.

Click here for definitions of key terms used in this article.

Antibiotic (or antimicrobial) resistance developed with the wide distribution of antibiotic medications in the 20th century. Resistance occurs when the medication is no longer capable of killing or preventing the reproduction of bacteria. A major global health challenge, antibiotic resistance makes treating diseases more difficult and expensive, and it results in fewer antibiotics that are effective in managing infectious diseases. Rates of antibiotic-resistant infections are rising in Canada. In hospital settings, infections that resist multiple drugs are also becoming more common. In 2019, an expert panel of the Council of Canadian Academies estimated that resistant infections contributed to more than 14,000 deaths in Canada the previous year. Canadian health agencies, medical professionals and industries are active in multiple efforts to combat this problem. 

Jean Cuthand Goodwill, OC, nurse, public servant and Indigenous health and education advocate (born 14 August 1928 on the Poundmaker Cree Nation, SK; died 25 August 1997 in Regina, SK). Cuthand Goodwill was one of the first Indigenous registered nurses in Canada. In 1974, she cofounded Indian and Inuit Nurses of Canada (now known as the Canadian Indigenous Nurses Association). She was a lifelong organizer, writer and educator who promoted First Nations health and culture.

Human beings have practised birth control throughout history. However, in 19th-century Canada, this practice was largely forbidden or taboo. It was only in the 1920s that groups of citizens formed to defend birth control. The information, services and products related to this practice became increasingly accessible after the war. During the 1960s, Canada decriminalized contraception and abortion. In the 1970s, the number of organizations and services promoting access to contraception and family planning began to increase. From then on, birth control became an integral part of the public health approach to sexual health.

Overdoses from a class of painkiller drugs called opioids are claiming the lives of thousands of Canadians from all walks of life. The death count is the result of an escalating public health crisis: an epidemic of opioid addiction. The crisis is made deadlier by an influx of illicit fentanyl and chemically similar drugs, but it can be traced to the medical over-prescribing of opioids, including oxycodone, fentanyl and morphine.

Onyenyechukwu (Onye) Nnorom, family physician, specialist in public health and preventive medicine (born 27 February 1981 in Montreal, Quebec). Nnorom is the associate director of the residency program in public health and preventive medicine at the University of Toronto’s Dalla Lana School of Public Health. She also leads the Black health curriculum at the university’s medical school. Her work addresses the health inequities that racialized and immigrant communities face.

Household food insecurity— the inadequate or insecure access to food due to financial constraints — is a serious public health problem in Canada. In 2017–18, 1 in 8 households were food insecure. This amounted to over 4.4 million Canadians. Of that number, 1.2 million were children under 18 years. While food banks are a well-known public response to food insecurity, most food insecure households do not use food banks and there is no evidence that food charity is a durable solution. There is wide consensus that governments need to act on food insecurity through income-based interventions.