Flu Vaccines 2026/27: A Pharmacist’s Guide to Types, Protection and Side Effects

Each autumn the flu vaccine is rebuilt from scratch. The strains change, the recommended products change, and the advice on who should have which vaccine is refined as new evidence comes in. For 2026/27 every flu vaccine used in the UK is trivalent, the preferred vaccines differ by age, and egg allergy is no longer a reason to avoid any of them. Those changes leave many people unsure what they are actually being offered.

This is the Edinburgh Vaccination Clinic guide to the flu vaccine for the 2026/27 season. It covers what the vaccine contains and how it works, the different types and who each one is for, how well it protects, pregnancy, allergies and other special situations, side effects and having flu vaccine alongside other vaccines. Each of the bigger topics has its own detailed page, linked throughout. It is written by the pharmacist team at 129 Bruntsfield Place, Edinburgh.

Why flu is worth vaccinating against

Influenza is not a heavy cold. People who have had it tend to remember the moment it hit: a high temperature, shaking chills, a pounding head and aching muscles, followed by days of exhaustion that keep them off work. A dry cough and sore throat usually come with it. Healthy adults generally get over it within a week, yet flu can be complicated by bronchitis, a secondary bacterial pneumonia or ear infection and, in rare cases, encephalitis.

Serious illness clusters in predictable places. Babies under six months, people in later life and pregnant women are all at higher risk, and so is anyone living with a chronic condition of the heart, lungs, kidneys, liver or nervous system, with diabetes, or with reduced immunity. Data from England’s 2010/11 season, when the pandemic H1N1 strain dominated, showed people under 65 in a clinical risk group were around eleven times more likely to die from flu than people of the same age without one, with far higher relative risks for those with chronic liver disease, neurological disease or immunosuppression.

Flu also passes from person to person with ease, carried in droplets and aerosols and on hands that touch contaminated surfaces. Symptoms can appear within a day or two of exposure, which lets it run through a family, a classroom, an office or a care home in a matter of days. Studies of healthcare staff suggest that between 30% and 50% of flu infections cause no obvious symptoms, which is one reason vaccination is recommended for people who work with the vulnerable as well as the vulnerable themselves.

What is in the 2026/27 flu vaccine?

Every February the World Health Organization reviews global surveillance and recommends which flu strains the coming northern hemisphere vaccines should target. Manufacturers then have a tight window to produce, test and release vaccine before autumn. For 2026/27 the recommendation covers one H1N1 strain, one H3N2 strain and one influenza B strain from the Victoria lineage.

The reason the egg and cell versions differ slightly is that viruses grown in eggs can pick up small changes as they adapt, so the reference strains are chosen to suit each manufacturing method. The second influenza B lineage, Yamagata, has had no confirmed detections worldwide since March 2020 and may have died out, which is why the UK has moved entirely to trivalent vaccines. Older four-strain vaccines are no longer used in the UK programmes.

Flu vaccine 2026/27: what has changed

Some of the changes people notice this autumn are new for 2026/27, and some have built up over the last few seasons. Taken together, they mean the vaccine on offer now is quite different from the one most adults remember.

The most practical change for adults is the move away from one standard vaccine for everyone. Older immune systems respond less strongly, so the vaccines preferred from 65 are designed to give a stronger response, while the egg-free vaccines preferred for younger adults avoid the small strain changes that happen when flu virus is grown in eggs. You do not need to pick the right product yourself. Whoever vaccinates you should name the product and the reason it was chosen for your age group.

The NHS programme in Scotland still centres on the people at most risk from flu and those who care for them. The groups are set out each year by the Scottish Government, and whether you personally qualify is covered in full in Bruntsfield Pharmacy’s guide to free flu jab eligibility in Scotland, or on NHS inform. Anyone outside the NHS programme can still be vaccinated privately with us.

How the flu vaccine works

Almost all UK flu vaccines are inactivated. They hold purified surface proteins or fragments of killed virus, nothing that can replicate, so they are incapable of causing flu. Injected into the upper arm muscle, they prompt the immune system to make antibodies against the haemagglutinin protein that each flu strain uses to enter cells. The one exception is the children’s live attenuated nasal spray, which uses weakened virus adapted to grow at the lower temperature inside the nose and nowhere warmer. It produces immunity in the nose and throat where infection starts.

A protective response normally takes around two weeks to form. Protection then wanes over the months that follow, and in adults, particularly older adults, there is good evidence that it is stronger in the first 90 days after vaccination than afterwards. Combined with the way flu viruses drift from year to year, that is why a fresh vaccine is needed every season. If your main question is when to have it this year, Bruntsfield Pharmacy, which runs this clinic, covers flu jab timing for the 2026/27 season in detail.

The main types of flu vaccine

Flu vaccines differ in how they are made and how strongly they stimulate the immune system. The Joint Committee on Vaccination and Immunisation (JCVI) reviews the evidence each year and sets out which types are preferred for each age group. These are the types in use in the UK this season.

The practical upshot for most people is simple: you will be offered the vaccine recommended for your age, and you do not need to choose. For a deeper explanation of how each type differs, who it is designed for and what the evidence shows, read our guide to the different types of flu vaccine.

Which flu vaccine is recommended for your age?

Age drives the recommendation because the immune system responds less strongly as we get older, and because some vaccines are licensed only for certain ages. For the 2026/27 season JCVI advises:

Children aged 6 months to under 9 years in a clinical risk group who have never had a flu vaccine before are offered a second dose at least four weeks after the first. Healthy children in the programme need only a single dose of the nasal spray.

How well does the flu vaccine work?

Flu vaccine effectiveness is real but variable. Three things drive it: the closeness of the match between vaccine strains and circulating viruses, which product is used, and who is being vaccinated. Protection against severe illness and hospital admission tends to be better than protection against any infection at all.

Adults under 65

Pooling trial data for adults aged 18 to 65 produced an effectiveness estimate of 59% for the standard egg-grown vaccine, and that average already includes seasons when the strains matched poorly. Part of the case for egg-free vaccines is H3N2 in particular, where changes picked up during growth in eggs have been tied to weaker protection.

Older adults

Standard vaccines work less well in older people, and pooled analyses of standard vaccines could not show significant effectiveness above the age of 75. That gap is the reason the adjuvanted and high-dose products exist, and in older adults the evidence for them extends to protection against hospital admission, not just infection. UK data cited in the national guidance also found the recombinant vaccine at least as effective as the other enhanced vaccines in older adults in recent seasons.

Children and the wider community

In children the nasal spray works well and may cope better with drifted strains than an injection. Children are also efficient spreaders of flu, so vaccinating them shields grandparents and babies too, a knock-on benefit recorded when every primary pupil was offered the vaccine in early pilot schemes.

What the flu vaccine does not do

The flu vaccine is specific to influenza. Covid-19, RSV, colds and the rest of winter’s viruses are untouched by it, and catching one of them soon after a flu jab is a common reason people decide, wrongly, that the jab failed. Nor does a vaccine from a previous winter carry much protection forward. Having had flu in a past season does not reliably protect you either, because the strains change and immunity from infection also fades. Each season is a fresh start.

Flu vaccination in pregnancy

Pregnant women are at higher risk of serious complications from flu, and flu in pregnancy has been associated with prematurity, lower birth weight and intensive care admission. The injected vaccine is safe in any trimester. Antibodies made by the mother also cross the placenta, giving the baby some cover through the first months of life, an age at which babies cannot have a flu vaccine of their own.

Pregnant women should be offered an injected (inactivated) vaccine rather than the nasal spray. If both RSV and flu protection are needed before delivery, the two vaccines can be given at the same appointment from 28 weeks of pregnancy. Pregnancy is one of the groups included in the free NHS programme in Scotland.

Egg allergy and other allergies

Because some flu vaccines are grown in eggs, egg allergy was once treated as a reason for caution. Research has since put that to rest: people with egg allergy, even those who have reacted severely to egg, do not have more serious reactions to egg-based flu vaccines. National guidance now says egg allergy is not a contraindication to any flu vaccine made for the UK, and that vaccinators need not even ask about it. The cell-based and recombinant vaccines contain no egg at all.

What does rule a vaccine out is confirmed anaphylaxis after an earlier flu vaccine or after one of its components. An allergy specialist can often still find a product that leaves out the ingredient responsible. A milder past reaction, such as a rash, does not normally mean stopping.

Weakened immunity, blood thinners and other situations

These are the common situations, not every one. Whether vaccination is right for you is decided at the appointment itself.

How to get started

1. Book online. Pick a slot in the booking calendar on this page, or phone the clinic on 0131 563 6824.
2. Complete a short health check. We go through allergies and past vaccine reactions, any chance of pregnancy, anticoagulants, conditions or treatments that lower immunity, and whether you have a temperature today.
3. Attend your appointment. When the vaccine is right for you, it is injected into the deltoid muscle of the upper arm, so clothing that leaves the shoulder easy to reach helps.
4. Leave with aftercare advice. We explain which side effects are normal, how long they usually last and what to do if you are concerned.

Flu vaccine side effects

Few medicines have been given to more people than the flu vaccine, and its safety record reflects that. Reactions are usually mild and brief. The arm may be sore, red or puffy, and some people run a slight temperature, feel shivery or tired, or have a headache and aches for a day or two. A firm, painless bump at the injection site is also normal. Children given the nasal spray may have a stuffy or runny nose for a few days, eat less, or seem tired.

In trials of the cell-based vaccine, 34% of adults reported injection site pain and 16% reported tiredness, most of it mild. Severe allergic reactions are very rare. Our full guide to flu jab side effects explains how common each effect is, what helps, and when to seek medical advice.

Having flu vaccine alongside Covid, RSV and other vaccines

Inactivated flu vaccines can safely share an appointment with most other vaccines, and national guidance would rather give them together than hold protection back. On the NHS, flu and Covid-19 vaccines are now routinely given at one visit to people due both. Shingles vaccine can go alongside flu vaccine too, and where two vaccines end up on different days, no minimum gap applies.

The exception is RSV vaccine in older adults. Trial data suggest giving it alongside flu vaccine blunts the response a little, so the two are normally booked on separate days. Where two vaccines that both contain an adjuvant are given together, side effects may be more noticeable. Our guide to having the flu and Covid vaccines together covers co-administration in detail, including how to plan several vaccines across one season.

Flu vaccination for work, travel and cruises

Some people need a flu vaccine for reasons beyond their own health. Health and social care staff are vaccinated to protect patients and to keep services running. Some employers in other sectors arrange vaccination for staff, and people whose jobs bring them into contact with poultry, wild birds, cattle or pigs are vaccinated to cut the small chance of a seasonal virus and an animal virus combining in one person.

Travel adds another layer. South of the equator, flu season broadly runs from April to September, and close to the equator there is no clear season at all. Cruise ships and coach tours keep large groups in shared spaces for days at a time, and flu outbreaks on ships are well documented. If a trip is coming up, raise flu when you plan your travel vaccinations, and leave two weeks for the vaccine to take effect before you go.

About Edinburgh Vaccination Clinic

Edinburgh Vaccination Clinic is the vaccination service of Bruntsfield Pharmacy, a registered community pharmacy at 129 Bruntsfield Place, Edinburgh. Our service is led by Ather Diab, Superintendent Pharmacist and Independent Prescriber.

Flu vaccines: your questions answered

Which flu vaccine will I be given this year?

Your age decides it. From 65 the options are adjuvanted, high-dose, cell-based or recombinant vaccine, and under 65 a cell-based or recombinant vaccine is the usual choice. The product name is confirmed with you before you are vaccinated.

Can the flu vaccine give me flu?

No. Nothing in the injected vaccines can replicate, and the weakened virus in the children’s spray cannot grow at the temperature of the lungs. A day of aches or tiredness is your immune system at work.

Do I need a flu vaccine every year?

Yes. The circulating strains shift between seasons, each year’s vaccine is reformulated around them, and the protection from any one dose wanes within months. Last winter’s vaccine will do little for you now.

Is the flu vaccine safe in pregnancy?

Yes. An injected flu vaccine is safe in every trimester, and antibodies cross the placenta to help protect the newborn. Pregnancy is covered by the free NHS programme in Scotland.

I am allergic to eggs. Can I have the flu vaccine?

Yes. Egg allergy does not rule out any UK flu vaccine, whether or not it was grown in eggs. Do mention any allergies when you book, and above all any serious reaction to a past vaccine.

Can adults have the nasal spray flu vaccine?

No. The nasal spray is licensed for children and young people aged 2 to under 18, so adults are given an injected vaccine. The injection is quick and goes into the muscle at the top of the arm.

Why are four-strain flu vaccines no longer used?

The fourth strain covered the B/Yamagata lineage, and no wild Yamagata virus has been confirmed anywhere since March 2020. Dropping it leaves a vaccine aimed only at strains still in circulation.

Can I have my flu and Covid vaccines on the same day?

Yes. They can be given at the same appointment, ideally in different arms. If you are an older adult also due an RSV vaccine, that is usually given on a different day.

Can I have the flu vaccine if I take a blood thinner?

Usually, yes. Most people on a stable blood thinner can have the normal injection. On warfarin, your INR monitoring needs to be current and the last result not above your target range. Let us know which anticoagulant you take when you book.

Do I need a GP referral to book with you?

No. Book straight into the clinic calendar online, and the suitability check happens at your appointment.

For more detail, read our guides to the different types of flu vaccine, flu jab side effects and having the flu and Covid vaccines together.

This page is for general information and does not replace an individual clinical assessment. Flu vaccines are prescription-only medicines and are only given after a check that vaccination is suitable for you. If you have side effects, contact your pharmacist or GP. In an emergency, call 999.

Sources: UKHSA, Immunisation against infectious disease (the Green Book), chapter 19, Influenza, 25 August 2026; Scottish Government, SGHD/CMO(2026)05, 23 March 2026, and SGHD/CMO(2026)18, 21 September 2026; JCVI advice on influenza vaccines; UKHSA, influenza vaccines marketed in the UK for 2026 to 2027; World Health Organization recommended composition of influenza vaccines for the 2026/27 northern hemisphere season; Summaries of Product Characteristics for the cell-based and adjuvanted trivalent influenza vaccines (electronic medicines compendium); NHS inform.