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Flu - vaccination

The seasonal flu vaccine (flu jab) protects against several strains of flu virus. These are the strains most likely to be circulating this flu season.

The vaccine is available every year to adults and children at risk of flu and its complications.

You need to get a new vaccine each year. This is because the strains of the virus change. This is why it is called seasonal flu. But people commonly call it flu.

You should get your flu vaccine from September to be covered for flu season.

Flu season usually runs from November to March.

At-risk groups

Some groups of people are more at risk of getting complications if they catch flu. Because of this, these 'at-risk groups' are strongly recommended to get the flu vaccine.

You are in an at-risk group if you:

  • are 65 years of age and over
  • are pregnant
  • have a long-term health condition
  • live in a nursing home or other long-term care facility
  • you have a long-term medical condition – for example, a heart, lung, kidney or neurological disease
  • have a weak immune system – for example, if you have diabetes or you're having chemotherapy
  • are a child with a moderate to severe neurodevelopmental disorder such as cerebral palsy

If you are in an at-risk group, you should get the flu vaccine as early into the flu season as you can.

You can also get the flu vaccine for free if you're in an at-risk group. But you may be charged a consultation fee, unless you have a medical card or a GP visit card.

People who should get the vaccine but are not at risk of getting complications include those who:

  • work in healthcare
  • are a carer
  • are in regular contact with pigs, poultry or water fowl

Where to get the flu vaccine

If you are 18 or over, you can get the flu vaccine at:

  • your GP surgery
  • a local pharmacy offering the service
  • an occupational health department

If you are under 18, you should get the vaccine from your GP.

How the flu vaccine works

The flu vaccine helps your immune system to produce antibodies to the flu virus. If you then come into contact with the virus, these antibodies will attack it and stop you from getting sick.

The flu vaccine starts to work within 2 weeks.

You need to have the flu vaccine every year. This is because the antibodies that protect you decline over time. Flu strains can also change from year to year.

The flu vaccine doesn't contain any live viruses. This means it can't give you the flu.

Safe and effective flu vaccine

Getting the flu vaccine is the best way to help protect yourself from getting the flu.

It won't stop all flu viruses and the level of protection may vary. So it's not a 100% effective and you may still get flu.

But if you do get flu after you have the vaccine, it's likely to be milder. It should also be shorter than it would have been.

Flu vaccines have been given to millions of people worldwide for over 60 years. Reactions are generally mild.

Flu vaccine side effects

You may have a mild fever and aching muscles for a couple of days after having the vaccine. Your arm may also be a bit sore where you got the injection.

Serious side effects of the flu vaccine are rare.

When you shouldn’t get the flu vaccine

You shouldn't get the flu vaccine if you have had a severe allergic (anaphylaxis) reaction to a previous flu vaccine or any part of the vaccine. 

If you are ill with a temperature greater than 38 degrees Celsius , you should wait until you are well before getting the vaccine.

Page last reviewed: 13/06/2019
Next review due: 13/06/2022