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Travel health.
Clearly explained.

Flu vaccine

Seasonal influenza vaccination reduces the chance of flu and serious flu-related complications.

What is it?

Influenza is a respiratory viral infection that can cause fever, aches, cough and exhaustion and may lead to pneumonia or worsening of underlying illness.

Where it may be relevant

  • People eligible for the annual NHS programme
  • People seeking suitable private seasonal vaccination
  • Travellers whose trip overlaps influenza circulation at their destination

Dose schedules.

The clinician will select the appropriate licensed schedule after reviewing age, health, previous doses and departure date.

Seasonal dose

Most adults and previously vaccinated children

Dose 1Day 0

First childhood season

Some children

Dose 1Day 0
Dose 2At least 4 weeks

A second dose may be advised depending on age, history and product.

Who may be eligible

  • Adults and children for whom an age-appropriate seasonal product is available
  • People with clinical risk factors, pregnancy or occupational exposure according to current programme guidance

Who may not be eligible

  • Anyone with a confirmed severe allergic reaction to a previous dose or a vaccine ingredient
  • People who are acutely unwell with a significant fever may need vaccination deferred
  • Pregnancy, breastfeeding, immune suppression and current medicines must be reviewed individually
  • Product choice depends on age, pregnancy, immune status and allergy history

Potential side effects

  • Pain, redness or swelling where the injection is given
  • Headache, tiredness, muscle aches or a mild fever
  • Feeling faint around the time of vaccination

Important risks and precautions

  • A severe allergic reaction is very rare and requires urgent treatment
  • Protection is not absolute, so relevant food, water, bite or exposure precautions remain important
  • The exact product and schedule must be confirmed during a clinical assessment

Clinical references

Further information.

Information is general and does not replace a personal assessment, prescribing decision or the latest destination-specific advice.

Frequently asked questions

What does the flu vaccine protect against?

It targets influenza strains selected for the current season.

Who should consider the flu vaccine?

It is relevant each season, especially for people at increased risk of complications or exposure.

How many doses of the flu vaccine are needed?

Most people receive one dose each season; some children need two in their first eligible season.

Can I have the flu vaccine close to departure?

Book an assessment even when departure is close. Whether vaccination can be completed or still provide useful protection depends on the product, previous doses and time available.

Can the flu vaccine be given with other vaccines?

Many vaccines can be given at the same appointment, but spacing rules can apply to some live vaccines. The clinician will check the products, your history and the proposed schedule.