Hypersensitivity/allergic reactions following immunisation can be classified as:
- Urticarial- a red, itchy skin rash often referred to as hives, which characteristically has a central raised white wheal surrounded by an area of redness
- Non-urticarial rash- skin changes that don’t involve hives
- Angioedema- swelling in the deeper layers of the skin
- Generalised allergic reaction- involving symptoms like vomiting and diarrhoea
- Anaphylaxis- a sudden onset and rapid progression of symptoms involving the skin, respiratory and/or cardiovascular systems
Suspected hypersensitivity reactions, particularly non-urticarial skin rashes following immunisation, are common, however true vaccine allergy, where a person is contraindicated from being immunised with the same vaccine in the future, is rare (less than 1 case per million doses).
A true vaccine allergy can only be diagnosed after specialist consultation with a vaccine allergy specialist, often after specific testing is carried out.
For management of immunisation hypersensitivity/allergic reactions, referrals should be made to SAEFVIC for review. SAEFVIC staff may direct the referral to an Immunisation Specialist or alternatively to a Vaccine Allergy Specialist.
Influenza vaccine and egg allergy
Based on prospective and retrospective studies of influenza vaccination in those with and without egg allergy (including egg anaphylaxis), the presence of egg allergy does not increase the risk of allergic reactions to the influenza vaccine.
The influenza vaccine can be administered in community vaccination clinics (which may or may not have direct medical practitioner supervision), General Practitioner surgeries or Immunisation clinics, as a single dose followed by the recommended 15 minute observation period.
MMR vaccine and egg allergy
Although measles and mumps vaccine viruses are cultivated in eggs, these vaccines (MMR or MMR-Varicella vaccines) contain negligible amounts of egg protein/allergen. Therefore individuals with allergy/anaphylaxis to egg can be safely immunised in the community setting without any need for extra monitoring or additional observation.
- NCIRS fact sheet- Vaccines, allergy and asthma
- MVEC: Influenza vaccine recommendations
- MVEC: SAEFVIC
- Australasian Society of Clinical Immunology and Allergy (ASCIA)
Author: Kirsten Perrett (Clinician Scientist Fellow, Murdoch Children’s Research Institute)
Date: April 2019
Materials in this section are updated as new information and vaccines become available. The Melbourne Vaccine Education Centre (MVEC) staff regularly reviews materials for accuracy.
You should not consider the information in this site to be specific, professional medical advice for your personal health or for your family’s personal health. For medical concerns, including decisions about vaccinations, medications and other treatments, you should always consult a healthcare professional.