Five things to know about vaccine allergies

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Only one in 760,000 vaccinations will respond with anaphylaxis and for all other side effects, there are ways around any problem, a new study shows.

Five facts about allergies to vaccines, pulled together by two McMaster University physicians, were published in the Canadian Medical Association Journal (CMAJ), are:

Immunoglobulin E (IgE)-mediated allergies to vaccines are extremely uncommon: Responding to a vaccine with hives, swelling, wheezing or anaphylaxis happens in about one of 760,000 vaccinations. It will start within minutes of the vaccination, is unlikely to begin after 60 minutes and highly unlikely to occur after four hours.

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