Peter Vadas MD, PhD

Allergist and Clinical Immunologist

Please see the important statement on the following page regarding continuity of clinical care during the current COVID-19 pandemic. Please monitor this website for information on resumption of ambulatory activities, as directed by St. Michael's Hospital and Ontario Health 

TVenom immunotherapy will be administered 
the weeks of June 22-26 and June 29-August 3:
Monday - Friday 9:30 - 11:30 AM
Monday - Thursday 1:00 - 3:00 PM
Venom immunotherapy and biologics:
Tuesday - Thursday:   9:30 - 11:30 and 
 1:00 - 3:00
October 6th - 8th
Please call 416.864.5777 before coming in to confirm hours

Dr. Peter Vadas is a specialist in Allergy and Clinical Immunology at St. Michael's Hospital, a teaching hospital fully affiliated with the University of Toronto.  He has a special interest in the investigation and management of anaphylaxis, anaphylactic shock, food allergies, adverse drug reactions and reactions to stinging insects.  His office practice at St. Michael's Hospital in Toronto includes investigation and treatment of allergic rhinitis, urticaria and angioedema, anaphylaxis, mastocytosis, asthma, adverse drug reactions and reactions to stinging insects, including venom immunotherapy.  Investigation and management of food allergies and anaphylaxis includes fresh food testing, drug testing and graded oral challenges.  Desensitization to certain medications may be an option where indicated.  Investigation of increased susceptibility to infections, includes hypogammaglobulinemia, common variable immunodeficiency and IgG subclass deficiency.

Patients living outside of the GTA may be seen via the Ontario Telemedicine Network (OTN) by referral.


Dr. Vadas is Division Head of the Division of Clinical Immunology and Allergy and a senior scientist at St. Michael's Hospital Research Institute, with a focus on basic, translational and clinical research in the areas of chemical mediators of anaphylaxis, biochemical and clinical risk factors predisposing to severe and fatal multi-system allergic reactions and mechanisms of induction of tolerance.


In addition to his clinical practice as an allergist and clinical immunologist, Dr. Vadas is an experienced legal medicine specialist in the areas of life-threatening anaphylaxis and anaphylactic shock, food allergies, adverse drug reactions and severe reactions to stinging insects.  He provides litigation support as an expert medical witness for both defence and plaintiffs.


For a summary of Dr. Vadas's clinical and research activities and publications related to food allergy and anaphylaxis, click here.


Dr. Vadas is the Head, Division of Allergy and Clinical Immunology at St. Michael's Hospital and an Associate Professor, Faculty of Medicine, University of Toronto.

Phone: 416.864.5777

Fax: 416.864.3033

email: or