Flu Vaccine in Pregnancy: Safety, Timing and Benefits
Key message: Pregnancy increases the chance of serious influenza complications. The inactivated seasonal flu injection can be given…
Key message: Pregnancy increases the chance of serious influenza complications. The inactivated seasonal flu injection can be given in any trimester when indicated and also passes antibodies that help protect the baby in early life.
Get urgent help: Call emergency services for breathing difficulty, facial or tongue swelling, collapse or severe hives after vaccination. Influenza symptoms with breathlessness, chest pain, confusion, dehydration, reduced movements or rapid deterioration need urgent clinical assessment.
Why is influenza important in pregnancy?
Pregnancy changes the immune, heart and lung systems and increases the chance of hospital admission and serious influenza complications. Influenza can also affect pregnancy outcomes.
Vaccination reduces the mother’s risk and helps protect the infant before the infant can receive routine influenza vaccination.
Which flu vaccine is used?
The injectable inactivated or approved non-live seasonal vaccine is used in pregnancy. The live nasal-spray vaccine is generally avoided during pregnancy.
The formulation changes by influenza season, so vaccination may be needed in each relevant season.
When can it be given?
WHO and major obstetric bodies support influenza vaccination at any stage of pregnancy when the seasonal programme is active. There is no need to wait until the second trimester.
Availability and the start of the influenza season vary by country; confirm the current Egyptian campaign and product.
What side effects are expected?
- Pain, redness or swelling at the injection site.
- Mild fever, headache, fatigue or muscle aches for a short period.
- Fainting related to injections in some people.
- Severe allergy is rare.
Can the vaccine cause flu or miscarriage?
The inactivated injection cannot cause influenza. Large safety monitoring systems have not shown an increased risk of miscarriage or pregnancy complications from recommended influenza vaccination.
A coincidental illness after vaccination still needs normal clinical assessment.
Who especially benefits?
- Anyone pregnant during an influenza season.
- Patients with asthma, diabetes, obesity, heart or immune conditions.
- People working in healthcare or high-exposure settings.
- Those who previously had severe influenza.
- Households wishing to reduce infection risk around a newborn.
Can it be given with other pregnancy vaccines?
Influenza vaccine can generally be given with other recommended non-live maternal vaccines at different injection sites. Programme timing and personal preference may influence scheduling.
Coadministration should not be confused with mixing vaccines in the same syringe.
What if I develop flu symptoms?
Vaccination does not prevent every infection. Pregnant patients with suspected influenza should contact a clinician early because antiviral treatment is time-sensitive and pregnancy is a higher-risk state.
Do not wait for a laboratory result before seeking advice when symptoms are significant.
Frequently asked questions
Can I have the flu vaccine in the first trimester?
Yes. Inactivated influenza vaccine can be used in any trimester when indicated.
Do I need it if I had it last year?
Seasonal strains and formulations change, so a new seasonal dose is usually recommended.
Can I catch flu from the injection?
No. The pregnancy injection is non-live.
Will it protect the baby?
Maternal antibodies provide some early infant protection, although they do not replace the child’s later vaccines.
What if I have an egg allergy?
Most people with egg allergy can receive an appropriate flu vaccine; the service should assess the previous reaction and available product.
Your next step
Confirm the current seasonal campaign and product locally. Seek early medical advice for flu-like illness in pregnancy even after vaccination.
Medical and content review: Dr Mohamed Abdelghany, Obstetrics & Gynecology Specialist, MRCOG (UK), MSc Obstetrics & Gynecology – Kasr Al-Ainy, Cairo University.
Last reviewed: 23 August 2026.
This information is for general education and does not replace individual medical assessment.
