Flu is more severe in pregnant women than in non-pregnant women. It can cause worsening of pre-existing health conditions, such as asthma, bronchitis, pneumonia, sepsis (blood poisoning), hospitalisation, and death (rarely).
Your risk is higher if you also have one or more other known risk factors such as asthma or diabetes.
Will my baby benefit from me having the flu vaccine?
Yes.
If you receive the flu vaccine, you are less likely to catch the flu and develop some of the associated complications. If you reduce your chance of catching the flu, you also reduce the chance of miscarriage, stillbirth, premature labour, and the risk of having a poorly grown baby as a result of the flu.
Flu can be really a serious illness in newborn babies and the only way to protect them is to get vaccinated yourself when you are pregnant. Following vaccination, your baby will directly receive some of your newly made antibodies through the placenta which will offer them protection against the same four flu strains for at least the first eight weeks of their life following birth. Some studies show babies can even be protected from flu for up to six months.
There is also another level of protection; by protecting yourself against the flu, you are reducing the chance of catching flu and therefore reducing the chance of passing it on to your newborn baby.
When can I receive the flu vaccine?
Pregnant women should aim to have the flu vaccine as soon as possible in pregnancy from the beginning of September until the end of March. This may be right at the beginning of pregnancy, if you find out you are pregnant in the winter months, or towards the end of your pregnancy if you fell pregnant in the spring/summer months.
Sometimes you may be offered two flu vaccines in your pregnancy, if you have fallen pregnant at the end of one flu season and are still pregnant in September when the next flu season begins. This will cover you for both seasons of flu.
Is the flu vaccine safe in pregnancy?
It is not uncommon to worry about the decision to have vaccinations in pregnancy and health professionals understand that you need to have as much information before you make a decision to have a vaccination while pregnant.
Pregnant women have been included in the flu vaccination programme since 2010 following a flu epidemic that caused an increase in the number of deaths. Since its introduction, the flu vaccine has been given to millions of pregnant women across the UK.
Data from over 11 million women who have received the flu vaccine in pregnancy show that, apart from mild pain at the site of the injection, there is no evidence of an increased risk of birth defects or stillbirths.
Although possible, the risk of a severe allergic reaction (also known as anaphylaxis) is extremely low. All medicines and food ingested, injected, or applied to the skin have a risk of causing this type of allergic reaction. Anaphylaxis is different from less severe allergic reactions because it causes life-threatening breathing and/or circulation problems. It is always extremely serious but all health care workers providing vaccines know how to treat this should it occur. The risk of a severe allergic reaction following immunisation is around one in 900,000.
There is no risk of catching the flu from receiving the flu vaccine. The vaccination provided has been deactivated (killed). Your immune system is likely to be very slightly weaker for one to two weeks while your body builds the protection against the flu, so you are slightly more susceptible to picking up other bacterial/viral infections during this time should you come in contact with them.
Does the flu vaccine work in pregnancy?
The flu vaccine is the best way of protecting yourself against the virus during pregnancy. Currently the vaccine is thought to be around 60 to 70 percent effective for pregnant women and near 90% effective for babies born from vaccinated mothers.
Women vaccinated in pregnancy more than halve the risk of developing flu in pregnancy.
The flu vaccine reduces the risk of women having a premature baby by more than two-thirds.
The flu vaccination, if given to pregnant women, has been shown to reduce the chance of babies being admitted to hospital with flu.
What side effects may I experience?
It is important to know that you cannot catch the flu by having the flu vaccine. Most people do not even feel any side effects following a vaccine however for those that do you could expect the following:
- Common – discomfort, swelling, or redness to the site of injection
- Unlikely – headaches, shivering, mild fever, or slight muscle aches
- Extremely rare – severe allergic reaction.
If the side effects are bothering you, paracetamol should help relieve some of the symptoms.