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Clinics & Inpatient Care Units

Allergy and Immunology Clinic

Allergic and immunologic mechanisms are central to many diseases. In recent years, immunologic treatments have significantly helped in the treatment of diseases as diverse as cancers, asthma, multiple sclerosis and inflammatory bowel disease.

The Allergy and Immunology Clinic at St. Michael’s Hospital is at the forefront of these targeted treatment plans and therapies. In the past 10 years, the clinic has made significant strides in understanding the development and advancing the treatments of diseases such as urticaria, angioedema and immunodeficiency. The clinic also established the first and largest rapid drug desensitization program in Canada. The clinic collaborates closely with many Department of Medicine Divisions across the teaching hospitals affiliated with the University of Toronto to advance the management of complex acute and chronic diseases such as cystic fibrosis, systemic mastocytosis, severe asthma and primary immunodeficiency.

Contact us:

Allergy and Immunology Clinic
Phone: 416-864-5777
Fax: 416-864-3033


36 Toronto St.
7th floor, Suite 700A
Toronto, Ontario, M5C 2C5

View a map of the wheelchair accessible entrance.


map of the wheelchair accessible entrance, and route from St. Michael's Hospital
  • View a larger version of the map on the right by clicking on it.

  • Public transit: The closest subway station is King Station on Line 1. Walk east on King Street and turn north (left) on Toronto Street to No. 36.

  • From St. Michael's Hospital: From the corner of Victoria and Queen Streets, walk two stop lights south on Victoria Street to Adelaide Street. Enter via either Adelaide Street or Toronto Street. View a map of this route.

  • Parking: Parking lots are available at 1 Toronto St. or 30 Adelaide St. E. There is also metered street parking on surrounding streets.

Physician profile

Dr. Peter VadasDr. Peter Vadas is head of the Allergy and Immunology Clinic at St. Michael’s Hospital, medical director of the Regional Anaphylaxis Clinic at St. Michael’s Hospital, and an associate professor of Medicine at the University of Toronto.

He is the past president of the Anaphylaxis Foundation of Canada, past chair of the Anaphylaxis Committee of the American Academy of Allergy, Asthma and Immunology and past head, Section of Anaphylaxis and Adverse Reactions of the Canadian Society of Allergy and Clinical Immunology. He serves on the executive of the Allergy Asthma and Immunology Society of Ontario. He had served for more than 10 years on the Scientific Advisory Council of the National Peanut Board. Dr. Vadas was an examiner in Allergy and Clinical Immunology for the Royal College of Physicians and Surgeons of Canada and served as head of the Section of Allergy and Clinical Immunology of the Ontario Medical Association. He has published more than 130 scientific articles and over 20 book chapters on allergies and anaphylaxis, including peer-reviewed articles in Nature, Journal of the American Medical Association and the New England Journal of Medicine.

His areas of research include risk factors for severe anaphylaxis, systemic mastocytosis and mast cell activation syndrome and the roles of platelet activating factor and platelet activating factor acetylhydrolase in severe and fatal anaphylaxis.


Overview: The Allergy and Immunology Clinic’s research programs are broad in scope and have resulted in innovative research discoveries that can support patients with diseases that require treatment to live normal lives. Get more information on the clinic’s research work and findings.