As flu season approaches every year, millions of Americans seek out flu shots to protect themselves and their loved ones. But did you know that while the flu remains a seasonal inconvenience for most healthy people, it still causes thousands of hospitalizations and deaths annually?
Last season made that point loudly. More on that below.
Vaccination remains one of the most effective ways to reduce your risk of catching and spreading the flu — and vaccines get updated each year to better match the circulating virus.
In This Article:
- Understanding the flu vaccine
- What options are available
- What we’re carrying this year — and what we’re recommending
- Key factors to consider
- What to expect afterward
Understanding the Flu Vaccine
How Flu Vaccines Work
Flu vaccines stimulate the production of specific virus-fighting antibodies. By teaching your immune system to recognize influenza antigens, the vaccine helps your body build those antibodies before you’re exposed.
We like to think of it as a dress rehearsal. If you meet the flu later, your body already knows the choreography.
Each year, global surveillance data is reviewed to determine which strains are most likely to circulate. The World Health Organization issues recommendations for its member countries, and the FDA determines the composition for vaccines sold in the United States. Those two don’t always land in exactly the same place, which is normal — WHO is writing for the whole world, and FDA is looking at what’s circulating here.
What Last Season Taught Us About Strain Matching
For 2025-2026, an H3N2 variant called subclade K emerged quickly and turned out to be drifted from the strain in that season’s vaccine. Hospitalization rates hit their highest level since 2010-2011.
Two things are worth taking from that.
First, even a mismatched vaccine worked. Real-world data put effectiveness against flu-related ER visits and hospitalization at 32-39% in adults and 72-75% in children — within the normal range for a flu vaccine, achieved in a year the vaccine wasn’t aimed quite right.
Second, the speed of strain updating matters. That’s a big part of why we’re making a different recommendation this year than we have in the past.
For 2026-2027, all three strain components were updated.
Comparing Flu Shots: Breakdown of What Options Are Available
Standard Flu Shots (Inactivated Influenza Vaccine)
Inactivated influenza vaccines (IIV) are the most common type. They contain killed virus particles, meaning they can’t cause the flu but still prompt an immune response.
A bit of history: the first standard flu shots were trivalent, protecting against three strains. In 2012, quadrivalent vaccines arrived, covering a fourth. For years, quadrivalent was the preferred choice. Since the 2024-25 season, all U.S. flu vaccines have moved back to trivalent — because the B/Yamagata lineage hasn’t been detected in circulation anywhere in the world since March 2020. A strain went extinct and we stopped needing to vaccinate against it. That’s a genuinely remarkable outcome.
High-Dose and Adjuvanted Flu Shots
These are two different things, and they get conflated constantly — including, in past years, by us.
As we age, our immune systems respond less robustly, which raises the risk of severe flu complications. Both of these approaches address that, by different means:
- High-dose (Fluzone High-Dose) contains roughly four times the antigen of a standard dose. More material, stronger response.
- Adjuvanted (Fluad) contains an added compound that amplifies the immune response to a standard amount of antigen.
Both are appropriate enhanced options for adults 65 and older. They are not the same product, and “Fluad HD” isn’t a thing — an error we’ve made in this space before and want to correct plainly.
mRNA Flu Shots — New This Year
mFLUSIVA is the first mRNA flu vaccine, approved for adults 50 and older.
Instead of delivering killed virus or purified protein, it delivers instructions telling your cells to build a piece of the flu virus’s outer surface, so your immune system can learn to recognize it. The mRNA breaks down within days, can’t cause the flu, and never interacts with your DNA.
It’s also a notably short ingredient list: three mRNA strands, protective lipids, and buffering salts. No egg, no antibiotics, no preservatives.
Nasal Spray Flu Vaccine (Live Attenuated Influenza Vaccine)
LAIV contains a weakened form of live virus and is given as a nasal spray — appealing if you’re needle-averse, especially for children.
It isn’t for everyone. It’s recommended only for healthy people aged 2 through 49 who aren’t pregnant. People with weakened immune systems, certain chronic conditions, or close contact with immunocompromised individuals should choose a different type.
Egg-Free Flu Shots — An Important Correction
We need to fix something we’ve said here before. We previously wrote that all flu shots in the U.S. are egg-free. That isn’t accurate, and we’d rather correct it than let it stand.
Most flu vaccines — including Fluzone, Fluarix, FluLaval, and Afluria — are still grown in eggs and contain trace egg protein. The egg-free options are Flucelvax (cell-based), Flublok (recombinant), and now mFLUSIVA (mRNA).
What we got right is the part that actually matters for your safety. Egg allergy is no longer a contraindication or precaution for any flu vaccine. Regardless of the severity of your previous reaction — including anaphylaxis — you can receive any age-appropriate flu vaccine, and no additional safety measures beyond those used for any vaccine are recommended. That’s been the guidance since the 2023-24 season, and it hasn’t changed.
So: egg allergy isn’t a barrier. But if you’d simply prefer an egg-free product, it’s worth knowing which ones actually are.
Our Options
We’re carrying three flu vaccines for 2026-2027:
- Fluzone — standard dose, approved 6 months and up
- Fluzone High-Dose — for adults 65 and older
- mFLUSIVA — the mRNA option, adults 50 and older
We don’t currently offer an LAIV (nasal spray) option. Talk to us or your provider if you think that’s the right choice for you specifically.
Where we’ve landed: if you’re 50 or older, we’re recommending mFLUSIVA
This is a change from what we’ve said in previous years, so let me explain the reasoning — including the part that argues against it.
Why we’re preferring it:
The immunogenicity data is better. In trials, mFLUSIVA generated stronger antibody responses than the high-dose flu vaccine in adults 65 and older. High-dose has been our go-to for that group for years, so a product outperforming it against that specific comparator is meaningful.
The platform can move faster. This is the one I keep coming back to after last season. Traditional flu vaccine manufacturing runs on a months-long process largely dependent on chicken eggs, which forces strain decisions to be locked in early — and early decisions are how you end up mismatched when something like subclade K shows up late. mRNA manufacturing can be updated far more quickly. That doesn’t help us this season, but it’s the direction I want flu vaccination to go, and last winter was a good argument for why.
Fewer ingredients. No egg, no antibiotics, no preservatives. Not a safety issue with the alternatives, but a cleaner option for people who want one.
It fills a real gap for ages 50 to 64. Enhanced flu vaccines have historically been a 65-and-older thing, leaving this age band with standard dose only. mFLUSIVA is fully approved from 50 up. That’s a genuinely new option.
The honest argument against it:
It has less history. Fluzone High-Dose has been in use for well over a decade with an extensive real-world track record in older adults. mFLUSIVA is in its first U.S. season. Strong trial data and years of accumulated post-marketing experience are not the same thing, and anyone who tells you otherwise is selling something.
The 65+ approval came through the accelerated pathway. Full standard approval covers ages 50 through 64. For 65 and older, FDA used accelerated approval, with a confirmatory study still underway. That’s a real caveat, and you deserve to hear it from your pharmacist rather than find it later.
So here’s my actual position. I think the data supports mFLUSIVA; I think the platform is where flu vaccination should be heading, and it’s what I’ll recommend if you ask me. I also think choosing Fluzone High-Dose because you’d rather have the longer track record is a completely reasonable decision, and I will not argue with you about it.
If you’re under 50, standard-dose Fluzone is the right choice, and there’s nothing complicated about it.
And the rule that outranks all of the above: the best flu vaccine is the one you actually get. Don’t delay to chase a specific product.
Key Factors to Consider When Comparing Flu Shots
Age and Health
Age and underlying conditions are the biggest factors. Children under 6 months can’t receive a flu vaccine at all. Adults 65 and older should get an enhanced option — high-dose, adjuvanted, recombinant, or now mRNA — rather than a standard dose. Adults 50 to 64 now have an enhanced option available for the first time.
Pregnant patients should receive an inactivated or recombinant vaccine, never LAIV. Flu vaccination during pregnancy protects the baby during their first months of life, before they’re old enough for their own dose.
Allergies and Sensitivities
Egg allergy is not a contraindication for any flu vaccine, at any severity. But anyone who has had a severe allergic reaction to a flu vaccine itself should talk with a provider about which product is appropriate — that history does affect the choice.
Personal Preferences
Comfort and convenience matter more than people expect, and we take them seriously.
One thing that’s simplified since we last wrote this: essentially all U.S. flu vaccine is now single-dose and preservative-free. If you were avoiding multi-dose vials over thimerosal, that concern is moot — the supply has converted. (You needn’t have worried in the first place, but that’s another story: Vaccine Ingredients in 2026: Less Scary Than You Might Think)
Availability and Insurance
Almost all insurance plans cover the full cost of a flu shot. Your plan might be unusual, so check with your insurer and tell us what we can do to help.
Worth knowing for New Yorkers: state law now requires coverage of vaccines recommended by New York’s Commissioner of Health, independent of federal advisory committee action. That’s a meaningful backstop this year.
We’re proud to offer affordable out-of-pocket options for those without coverage, and we can handle walk-ins promptly — though during peak season, making an appointment is genuinely better for both of us.
Learn More: Dr. Neal’s Vaccine Recommendations Rundown: Who Needs What and When
What to Expect After Getting the Flu Shot
Common Side Effects
Some people experience mild soreness at the injection site, low-grade fever, or muscle aches. These are generally minor and short-lived — usually a day or two.
One note on mFLUSIVA: in trials, local and systemic reactions typically started about two days after vaccination and lasted about two days, and were mostly mild to moderate. If you’ve had mRNA COVID vaccines, that pattern will feel familiar.If symptoms persist beyond a few days, contact your provider. While rare, it’s possible to develop SIRVA — shoulder injury related to vaccine administration — if the injection isn’t given properly. This is one of several reasons to care about who’s holding the syringe.
Learn More: What is SIRVA? Symptoms, Causes, Treatment
When to Contact Your Healthcare Provider
Severe reactions are rare but possible. Difficulty breathing, hives, or swelling — particularly within hours of vaccination — require immediate medical attention.
And again: mild symptoms that grow increasingly uncomfortable or don’t subside within a few days may indicate SIRVA. Contact your provider.
Here’s to a Flu-Free Fall
Getting vaccinated is an essential step in protecting your health and the health of those around you. With several options available, there’s a vaccine for everyone — young or old, healthy or managing chronic conditions, allergic to eggs or not.
This year there’s genuinely something new to consider, and we’ve told you both why we like it and what gives us pause. That’s the conversation we’d rather have than a simple recommendation you can’t interrogate.
Come see us, and we’ll walk through it. Or just come get your shot — that part matters more than which one you pick.