Immunisation Information - Influenza

Influenza vaccination

NHS Flu vaccinations will not start until 3rd October 2024. Clinics will start later this year to help improve the effectiveness of the vaccination.

We will invite you to book an appointment for your free flu vaccination before the flu season, usually at the beginning of August, for vaccination in October. You are eligible for a flu vaccination if you are aged 65 years and over, adults and children of any age who are at risk of serious illness from flu due to an underlying health condition.

What causes flu?

Flu is caused by viruses that are spread from person to person. They infect the respiratory system, where they can lead to pneumonia and other complications. The viruses are constantly changing and this is one of the main reasons why people should be vaccinated annually.

How is flu spread?

Flu is spread by coughs and sneezes that propel infected droplets of saliva or nasal secretions into the air which are then breathed in by others. The disease is also spread by people touching surfaces that the droplets have landed on and then touching their mouth, nose or eyes. This is why frequent hand washing or using an antiseptic hand rub is so important during the winter flu season.

How can I avoid catching flu?

It's quite hard to avoid because people may be able to pass the virus on to others a day or so before symptoms start to show (as well as up to seven days after), so they won't know if they are spreading the virus or not. So it's very hard to avoid contact with people infected with the flu virus. And, of course, members of your family can always bring it into the home.

You can also wash your hands regularly but this won't stop you catching the disease by breathing in the infected droplets in the air.

So the best way to help avoid getting flu is by having the vaccination.

Why is flu more serious for me if I am an older person?

The risk of serious illness from flu and consequent hospitalisation and death is higher among those aged 65 years and older as they are more likely to have an underlying health problem and the immune system does not work as well. The best way for people at risk from flu to protect themselves is to get the flu vaccine.

Why do underlying health conditions or pregnancy make it more serious for someone who gets flu?

You are at particular risk of severe illness if you get flu and have an underlying health condition, even if well managed, or are pregnant. This means that you are more likely to be admitted to hospital or on rare occasions be admitted to intensive care and even die.

Will I be completely protected by the vaccination?

Because the flu virus can change from year to year there is always a risk that the vaccine does not match the circulating virus. During the last ten years the vaccine has generally been a good match for the circulating strains although last year it was less so.

Will I get any side effects?

There are some fairly common but mild side effects. Some people get a slight temperature and aching muscles for a day or two afterwards, and your arm may feel a bit sore where you were injected. Any other reactions are very rare. Serious side effects in children are uncommon but many develop a runny or blocked nose, headache, general tiredness and some loss of appetite that lasts for a short period.

I had the flu vaccination last year. Do I need another one this year?

Yes; the flu vaccine for each winter helps provide protection against strains of flu that may be different from last year. For this reason, we recommend that even if vaccinated last year, you should be vaccinated again this year.

Where can I get more information?

Visit the flu pages on the NHS Choices website at:

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