SOS Allergo · I understand & manage
Vaccinations and allergies
Understanding true contraindications and receiving vaccines safely
In this sheet
3 essential points
Having allergies does not mean ‘no vaccines’
Asthma, rhinitis, eczema or food allergy are not, by themselves, general contraindications to vaccination.
A reaction after vaccination is not necessarily an allergy
Arm pain, local redness, tiredness, aches or a moderate fever are possible post-vaccination effects and are not, by themselves, an immediate allergy.
A severe immediate reaction must be clarified
The exact vaccine, timing, symptoms and, when needed, the component involved must be identified before deciding on subsequent doses.
Expected reaction or allergic reaction?
- Situation
- Common post-vaccination effects
- What you need to know
- Local pain, redness or swelling; tiredness; aches; moderate fever depending on the vaccine.
- Situation
- Signs that may suggest an immediate allergic reaction
- What you need to know
- Generalised urticaria; swelling of the lips or tongue; breathing difficulty; altered voice; feeling faint or a rapidly progressive generalised reaction.
| Situation | What you need to know |
|---|---|
| Common post-vaccination effects | Local pain, redness or swelling; tiredness; aches; moderate fever depending on the vaccine. |
| Signs that may suggest an immediate allergic reaction | Generalised urticaria; swelling of the lips or tongue; breathing difficulty; altered voice; feeling faint or a rapidly progressive generalised reaction. |
Feeling faint just after the injection: is it necessarily an allergy?
No. A vasovagal episode, hyperventilation or a reaction to stress or pain can look alarming without being allergic. However, do not draw your own conclusion after a significant reaction: it must be documented and assessed.
‘I have many allergies’: am I at greater risk with every vaccine?
Having several allergies, rhinitis, asthma or eczema does not by itself justify vaccination in hospital or preventive testing. Risk depends mainly on a history genuinely compatible with a reaction to the vaccine or one of its components.
Egg allergy: vaccines are not all the same
MMR
Egg allergy is not a reason to systematically avoid the measles, mumps and rubella vaccine. MMR can be given according to usual recommendations to people with egg allergy.
Influenza
Egg allergy does not automatically prevent influenza vaccination. The professional selects an appropriate vaccine according to current French recommendations and the product available.
Yellow fever
This is different: significant egg allergy requires specialist assessment before yellow-fever vaccination.
Excipients may sometimes be relevant
In the rare allergic reactions to vaccines, the cause may be a component or excipient rather than the vaccine antigen itself. Depending on the product, these may include gelatin, trace amounts of some antibiotics, PEG, polysorbates or other excipients.
PEG and polysorbates: is systematic testing needed?
No. True PEG allergy exists but remains rare. Tests with vaccines or excipients are not used systematically to predict vaccination tolerance. They are reserved for situations selected by the specialist team.
I reacted to a previous dose: is that the end of this vaccine for me?
Not necessarily. A suspected reaction after one dose does not automatically mean that every subsequent dose is permanently contraindicated. The team can review the records, identify the exact product, discuss targeted investigations and, depending on the circumstances, select another formulation or arrange another administration in an appropriate setting.
Are allergy tests needed before every vaccine?
No. Skin prick tests, IgE tests or skin tests ‘just in case’ are not recommended for every person with allergies. The assessment must answer a genuine clinical question linked to a previous reaction or relevant component.
What if the reaction was delayed?
Delayed local redness, pain or some rashes do not automatically indicate an immediate vaccine allergy. However, a severe skin reaction, blisters or skin detachment, mucosal involvement, high fever with systemic illness or any unusual severe reaction requires medical assessment before another dose.
Should I take an antihistamine before vaccination?
Not routinely. Do not take ‘preventive’ treatment for a vaccine allergy without instructions from your healthcare professional. An antihistamine does not prevent anaphylaxis.
Why do we wait after vaccination?
A short period of observation on site is usually planned after an injectable vaccine. Its main purpose is to manage the rare immediate reactions and some fainting episodes promptly. In France, observation for about 15 minutes is commonly recommended after injection.
Emergency: severe generalised reaction
Breathing difficulty, altered voice, swelling of the tongue or throat, severe faintness, loss of consciousness or a rapidly progressive reaction is a medical emergency: call 15 or 112 in France. Intramuscular adrenaline is the first-line treatment for anaphylaxis; antihistamines and corticosteroids do not replace it.
If a reaction occurs: what will genuinely help your allergist
- What to record
- Exact vaccine
- Why it is useful
- Name, manufacturer and batch number if available.
- What to record
- Timeline
- Why it is useful
- Date, time and interval between injection and the first symptoms.
- What to record
- Symptoms
- Why it is useful
- Precise description, photographs if possible, areas affected and progression.
- What to record
- Management
- Why it is useful
- Treatments received, emergency medical services/ED attendance and any adrenaline given.
- What to record
- History
- Why it is useful
- Previous doses tolerated or earlier reactions.
- What to record
- Documents
- Why it is useful
- Vaccination record and medical report of the reaction.
| What to record | Why it is useful |
|---|---|
| Exact vaccine | Name, manufacturer and batch number if available. |
| Timeline | Date, time and interval between injection and the first symptoms. |
| Symptoms | Precise description, photographs if possible, areas affected and progression. |
| Management | Treatments received, emergency medical services/ED attendance and any adrenaline given. |
| History | Previous doses tolerated or earlier reactions. |
| Documents | Vaccination record and medical report of the reaction. |
My child has eczema, asthma or food allergy
Vaccination schedules change: use the current French version
The vaccination schedule is updated regularly. Consult the current French version on the websites of the Ministry of Health, Assurance Maladie or Vaccination Info Service.
Common misconceptions
- Misconception
- ‘My child has many allergies: vaccines are dangerous for them.’
- SOS Allergo guidance
- Not in general. Common allergic conditions do not prevent recommended vaccinations.
- Misconception
- ‘Egg allergy means no MMR.’
- SOS Allergo guidance
- False.
- Misconception
- ‘Egg allergy means no influenza vaccine.’
- SOS Allergo guidance
- False. The choice depends on French recommendations and the vaccine available.
- Misconception
- ‘I reacted to one dose, so I can never receive this vaccine again.’
- SOS Allergo guidance
- Not necessarily. Specialist assessment can often clarify the situation.
- Misconception
- ‘An antihistamine before the injection protects me from anaphylaxis.’
- SOS Allergo guidance
- No.
| Misconception | SOS Allergo guidance |
|---|---|
| ‘My child has many allergies: vaccines are dangerous for them.’ | Not in general. Common allergic conditions do not prevent recommended vaccinations. |
| ‘Egg allergy means no MMR.’ | False. |
| ‘Egg allergy means no influenza vaccine.’ | False. The choice depends on French recommendations and the vaccine available. |
| ‘I reacted to one dose, so I can never receive this vaccine again.’ | Not necessarily. Specialist assessment can often clarify the situation. |
| ‘An antihistamine before the injection protects me from anaphylaxis.’ | No. |
You may also want to read
Key points
A suspected vaccine allergy should be clarified. The goal is to vaccinate safely whenever possible, without unnecessarily removing important protection.
Main references
- Vaccination Info Service. Allergies, contre-indications et prise en charge de l’anaphylaxie après vaccination. 2026.
- Nilsson L, Brockow K, Alm J, et al. Vaccination and allergy: EAACI position paper. Pediatr Allergy Immunol. 2017;28:628-640.
- Turner PJ, Worm M, Ansotegui IJ, et al. Vaccines and allergy: Back to the right places. Allergy. 2024.
- Greenhawt M, Abrams EM, Shaker M, et al. Guidance on immediate allergic reactions to COVID-19 vaccines/excipients. J Allergy Clin Immunol Pract. 2023.
- Ministère chargé de la Santé / Assurance Maladie. Calendrier des vaccinations 2026.
This sheet provides general information. It does not make a diagnosis or replace medical consultation, current vaccination recommendations or personalised instructions from your healthcare professional.
Scientific review: September 2026 · sosallergo.fr