Influenza vaccination information from NHS Choices on TheFamilyGP.com

Influenza vaccination

Introduction * Getting your flu vaccination * About the flu vaccine * Who should have the flu vaccination? * Who should not have the flu vaccination? * Frequently asked questions * Flu jab information in other languages

Flu vaccine

Everything you need to know about the seasonal flu jab, including who should have the flu vaccine, how to get it and whether there are side effects.

Flu (also known as influenza) is a highly infectious illness caused by the flu virus. It spreads rapidly through small droplets coughed or sneezed into the air by an infected person.

Studies have shown that flu vaccines provide effective protection against the flu, although protection may not be complete and may vary between people. Protection from the vaccine gradually decreases and flu strains change over time. Therefore, new vaccines are made each year and people at risk of flu are encouraged to be vaccinated every year.

The flu vaccination is offered to people in at-risk groups. These people are at greater risk of developing serious complications if they catch flu, such as pregnant women and elderly people.

Find out who should have the flu jab.

This year's flu jab (2011)

This winter’s flu jab protects against the same three strains of flu as last year’s vaccines. These include the H1N1 strain of the flu virus. H1N1 is the same strain of flu that caused the 2009 swine flu pandemic.

H1N1 is included because it is likely to be one of the major flu strains circulating in Britain this winter.

The best time to have a flu jab is in the autumn, from September to early November.

Find out more about getting the flu jab.

Flu vaccine

Check with your GP, nurse or pharmacist if you think you need a seasonal flu vaccine. Most GP surgeries organise vaccination sessions in the autumn.

If you think you need a flu vaccination, check with your GP, nurse or local pharmacist.

Find out more about who should have the flu jab.

Most GP surgeries organise special vaccination sessions in the autumn.

Find your local GP surgery or health centre.

The flu virus circulates every winter, usually over a few weeks. The best time to have a flu jab is in the autumn, from September to early November.

Do not wait until the winter, when the flu virus will be circulating, before getting your flu jab.

Can I get the flu vaccine if I'm not in a risk group?

People who aren’t in the at-risk groups can pay for a flu vaccination privately. The flu vaccine may be available from pharmacies or in supermarkets. It would be provided on a private patient basis and you would have to pay for it.

Vaccination: Vaccination or immunisation is usually given by an injection that makes the body's immune system produce antibodies that will fight off a virus.

Flu vaccine

A new flu vaccine has to be produced each year. This is because the flu virus continually changes and different types of flu virus circulate each winter.

A new flu vaccine has to be produced each year. This is because the flu virus continually changes and different types of flu virus circulate each winter.

In February each year, the World Health Organization (WHO) makes an assessment of the strains of flu virus that are most likely to be circulating during the following winter in the northern hemisphere. Based on this assessment, WHO recommends which three flu strains the vaccines should contain for the forthcoming winter. Vaccine manufacturers then produce flu vaccines based on the WHO recommendations. These flu jabs are used for the countries in the northern hemisphere, not just the UK.

Production of the vaccine starts in March each year after the WHO announcement. The vaccine is usually available in the UK from September.

How the vaccine is made

The flu vaccine contains three different types of flu virus (usually two A types and one B type). For most vaccines, the three strains of the viruses are grown in hens’ eggs. The viruses are then killed (deactivated) and purified before being made into the vaccine.

How it protects you

The vaccine causes your body’s immune system to make antibodies to the flu virus.

Antibodies are proteins that recognise and fight off germs that have invaded your blood, such as viruses. If you catch the flu virus later on, the immune system will recognise it and immediately produce the antibodies to fight it.

It may take 10–14 days for your immune system to respond fully after you have had the flu injection.

The antibodies against the flu strains will gradually decrease over time and the flu strains can change from year to year. You need to have a flu jab every year to ensure the best protection against the latest strain of the virus.

Are there any side effects?

The flu jab does not usually cause side effects. Sometimes, it can cause mild fever and slight muscle aches for a day or so.

The flu jab cannot cause flu as there are no active viruses in the vaccine. However, people sometimes catch other flu-like viruses, or very occasionally could catch flu before the vaccine takes effect.

Allergic reactions to the vaccine are rare.

Allergic: An allergen is a substance that reacts with the body's immune system and causes an allergic reaction.
Antibodies: Antibodies are proteins in the blood. They are produced by the immune system to fight against bacteria, viruses and disease.
Fever: A high temperature, also known as a fever, is when someone's body temperature goes above the normal 37C (98.6F).
Vaccination: Vaccination or immunisation is usually given by an injection. It makes the body's immune system produce antibodies that will fight off a virus.

Flu vaccine

Find out who should have the seasonal flu jab, including pregnant women, older people and people with a medical condition such as severe asthma.

For most people, flu is unpleasant but not serious. You will usually recover within a week.

However, certain people are at greater risk of developing serious complications of flu, such as bronchitis and pneumonia. These conditions may require hospital treatment.

The flu vaccine is offered free to people who are at risk, to protect them from catching flu and developing serious complications.

At-risk groups

It is recommended that you have a flu jab if you:

are 65 years old or over
are pregnant (see below)
have a serious medical condition (see below)
are living in a long-stay residential care home or other long-stay care facility (not including prisons, young offender institutions or university halls of residence)
are the main carer for an elderly or disabled person whose welfare may be at risk if you fall ill
are a frontline health or social care worker (see below)

If you are the parent of a child who is over six months old and has a long-term condition on the list below, speak to your GP about the flu vaccine. Your child's condition may get worse if they catch flu.

Pregnant women

It is recommended that all pregnant women should have the flu vaccine, whatever stage of pregnancy they're in.

This is because there is good evidence that pregnant women have an increased risk of developing complications if they get flu, particularly from the H1N1 strain.

Studies have shown that the flu vaccine can be safely and effectively given during any trimester of pregnancy. The vaccine does not carry risks for either the mother or baby. In fact, studies have shown that mothers who have had the vaccine while pregnant pass some protection to their babies, which lasts for the first few months of their lives.

People with medical conditions

The flu vaccine is offered free to anyone who is over six months of age and has one of the following medical conditions:

chronic (long-term) respiratory disease, such as severe asthma, COPD or bronchitis
chronic heart disease, such as heart failure
chronic kidney disease
chronic liver disease, such as hepatitis
chronic neurological disease, such as a stroke, TIA or post-polio syndrome
diabetes
a weakened immune system due to conditions such as HIV, or treatments that suppress the immune system such as chemotherapy

If you live with someone who has a weakened immune system, you may also be able to have a flu vaccine. Speak to your GP about this.

Frontline health or social care workers

Employers are responsible for ensuring that arrangements are in place for frontline healthcare staff to have the flu vaccine.

Outbreaks of flu can occur in health and social care settings, and staff, patients and residents are at risk of infection.

Frontline health and social care staff should protect themselves by having the flu vaccine to prevent the spread of flu to colleagues and other members of the community.

If you care for someone who is elderly or disabled, speak to your GP about getting vaccinated against seasonal flu. You should also ensure that the person you care for has the flu jab.

Flu vaccine

You should not have the seasonal flu vaccine if you have ever had an allergic reaction to a flu vaccine or one of its ingredients. This happens very rarely.

You should not have the flu vaccine if you have ever had an allergic reaction to a flu vaccine or one of its ingredients. This happens very rarely.

If you have had a confirmed very serious (anaphylactic) reaction to egg, have an egg allergy with uncontrolled asthma or another type of allergy to egg, your GP may decide that you should be vaccinated with an egg-free vaccine. One such vaccine is available for this flu season (called Preflucel, manufactured by Baxter Healthcare).

If no egg-free vaccine is available, your GP will identify a suitable vaccine with a low egg (ovalbumin) content, the details of which will be in the Green Book - Immunisation against infectious disease (PDF, 3.21Mb).

Depending on the severity of your egg allergy, your GP may decide to refer you to a specialist for vaccination in hospital.

If you are ill with a fever, do not have your flu jab until you have recovered.

Allergic: An allergen is a substance that reacts with the body's immune system and causes an allergic reaction.

Flu vaccine

Frequently asked questions about the flu vaccine, including who is entitled to a free flu jab and when is the best time to have it.

When am I most at risk from flu?

Can I go to work or school if I have been in contact with somebody who has recently been diagnosed with flu?

Does everyone need a flu jab?

Why are certain groups targeted for the flu jab?

Can a GP vaccinate anyone else?

Is my child entitled to the flu vaccine?

How long will the flu jab protect me for?

How long does the flu vaccine take to become effective?

If I had the flu jab last year, do I need it again now?

Can the flu jab cause flu?

When is the best time to get my flu jab?

Is there anyone who cannot have a flu jab?

Can people get the flu vaccine privately?

Why is it recommended that healthcare workers are vaccinated?

Can I have a flu jab if I'm breastfeeding?

Can you have the flu vaccine at any time during pregnancy?

How do I get the flu vaccine if my GP has run out?

Do I need Tamiflu and how do I get a prescription?

I have had flu symptoms for five days. Can I have visitors?

When am I most at risk from flu?

Flu circulates every winter, usually over a few weeks. Therefore, many people get ill around the same time. In a bad year, this can be an epidemic. However, it is impossible to predict how much flu there will be any year.

Can I go to work or school if I have been in contact with somebody who has recently been diagnosed with flu?

Yes. You should go about your everyday business, but stay at home if you develop flu-like symptoms.

Does everyone need a flu jab?

Ask your GP about having a flu vaccination if:

you're 65 or over
you're pregnant
you have a serious medical condition
you live in a residential or nursing home
you're the main carer for an elderly or disabled person whose welfare may be at risk if you fall ill
you or your child (over 6 months) is in a risk group

You should also be offered the flu vaccination if you are a healthcare or social care worker directly involved in patient care.

Find out more about who should have the flu vaccine.

Why are certain groups targeted for the flu jab?

Complications such as bronchitis and pneumonia are more common in people with other diseases, especially if they are also elderly. Almost all of the deaths related to flu are in people in these groups.

In long-stay residential homes, vaccination prevents the rapid spread of flu among residents.

Can a GP vaccinate anyone else?

The final decision about who should be offered the vaccination is a matter for the patient's GP, based on the person's medical history.

Is my child entitled to the flu vaccine?

If your child is over six months old and is in a high-risk group for flu, they should have the seasonal flu vaccine. The number of doses needed varies with age and whether your child has had the flu vaccine before.

Find out more about who should have the flu vaccine.

How long will the jab protect me for?

The flu jab will provide protection for you for the upcoming flu season.

How long does the flu vaccine take to become effective?

The vaccine causes your body’s immune system to make antibodies to the flu virus.

It may take 10–14 days for your immune system to respond fully after you have had the flu injection.

If I had the flu jab last year, do I need it again now?

Yes. The viruses that cause flu can change every year, which means the flu (and the vaccine) this winter may be different from last winter.

Can the flu jab cause flu?

No. The vaccine does not contain any live viruses, so it cannot cause flu. Some people get a slight temperature and aching muscles for a couple of days afterwards, and your arm may feel a bit sore where you had the injection. Other reactions are rare and flu jabs are very safe.

When is the best time to get my flu jab?

The best time is as soon as your GP gets supplies of the vaccine. This will be between September and early November. Do not wait until winter, when the flu virus is circulating.

Is there anyone who cannot have a flu jab?

You should not have the flu vaccine if you have ever had an allergic reaction to a flu vaccine or one of its ingredients. This happens very rarely.

Depending on the severity of your egg allergy, your GP may refer you to a specialist for vaccination in hospital.

If you are ill with a fever, do not have your flu jab until you have recovered.

Can people get the flu vaccine privately?

Why is it recommended that healthcare workers are vaccinated?

Vaccination prevents healthcare workers passing flu on to or getting flu from their patients. It also helps the NHS to keep running effectively during a flu outbreak, when GPs and hospital services are particularly busy.

Can I have a flu jab if I'm breastfeeding?

Yes. The vaccine poses no risk to a breastfeeding mother or her baby, or to pregnant women.

Can you have the flu vaccine at any time during pregnancy?

Yes. The flu vaccine is safe to have in any stage of pregnancy, including in the first trimester and up to the expected due date. It helps protect the mother and also protects the baby from catching flu.

How do I get the flu vaccine if my GP has run out?

GPs have already been asked to check their stocks. If they have run out, they have been advised to work with neighbouring practices or the primary care trust to obtain further supplies. The vaccine manufacturers and suppliers still have stocks available for ordering.