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Effectiveness of the children's flu vaccine

The NHS says: 


‘The children's flu vaccine aims to protect children against the most common types of flu viruses. 


There's still a chance your child might get flu after getting vaccinated, but they're less likely to get seriously ill or need to go to hospital. 


The vaccine usually takes up to 14 days to work. 


Protection from the flu vaccine goes down over time and the types of flu the vaccine protects against are updated each year. This is why it's important to get the flu vaccine every year.’ 

Blocks spelling out word data

Flu vaccine underperformance

There may be more to it, however, than how well the vaccine matches the circulating flu strains. 


This article from Science.org addresses other possible explanations for flu vaccine underperformance, quoting one epidemiologist as saying: ‘it's a terribly inadequate vaccine’. 


A national US study looking at respiratory and all-cause mortality from 1968 to 2005 found they ‘could not correlate increasing vaccination coverage after 1980 with declining mortality rates in any age group’. They concluded that ‘observational studies substantially overestimate vaccination benefit’. 


In 2025, a large study from the Cleveland Clinic in Ohio followed 53,402 employees, looking at cumulative influenza infections in vaccinated staff members compared with their unvaccinated colleagues. In the early weeks there was no difference and over the winter season the cases increased significantly more rapidly in the vaccinated than unvaccinated, giving a vaccine efficacy of minus 26.9%. 


Here is their conclusion: 


‘This study was unable to find a protective influence of influenza vaccination among working-aged adults during the 2024-2025 respiratory viral season and found that influenza vaccination was associated with a higher risk of influenza when influenza activity was high.’ 


Tom Jefferson, the lead author of the Cochrane Review on Vaccines for Preventing Influenza in Healthy Children, has said: ‘We have few trials, and masses of very poor quality observational evidence.’ He puts it plainly: ‘Influenza vaccines are about marketing and not science.’  


Indeed, the government guide to flu vaccination for children is clearly headed ‘Promotional material’: 

Further reading

Doc Malik has written a lengthy deep-dive into the children’s flu vaccine, available here. He has also produced an accompanying podcast episode. 


Among other things, he notes: 

  • The vaccine is described as being free, but it is actually paid for with our taxes. 
  • The NHS doesn’t offer parents clear information about exactly how risky (or not risky) flu is for their child – despite government data being available. 
  • Giving a child a vaccine to protect others is ethically questionable. 
  • The three virus strains inside Fluenz are not fixed, they are swapped out every single year. This has implications for safety studies, both complete and ongoing, as the product is not the same each year. 
  • Parents of asthmatic children should be particularly cautious about the vaccine. 


Doc Malik states: 


‘...when the government and health authorities talk about flu causing “complications” and “hospitalisation,” what they are actually describing, in their own data, is a risk to your child of just over one in 100,000 per year, and roughly half of even that small risk sits in children too young to be eligible for the nasal vaccine at all.’

Girl reading

Next steps

Girl in woods

You might want to talk to your doctor or health provider about the flu vaccine, before deciding whether to go ahead. Read more about how you might approach this. 


If you decide not to go ahead, you will need to make this clear and our template letter for school may be of use. (See link below.)


You might want to consider getting your child a card from the Control Group, to help them assert their position in your absence. 

Honey and lemon drink

Staying healthy, with or without vaccination

There are many ways to protect your children from illness. Learn more on our family health page. 


If you do decide to vaccinate, there are options for supporting your child through vaccination. 

Template letter to schools regarding vaccination

General vaccine refusal letter final (docx)

Download

Your Child: Your Choice

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Page last reviewed: October 2026

Please note: this website is for information only. It is not a replacement for advice from your primary healthcare provider, and it is not legal advice. 


Please consult your healthcare provider before making any changes to medication, diet or lifestyle.


The views of the individuals featured on this website are not necessarily the views of Informing Consent. However, we are united in our efforts to protect children's health.      


Copyright © 2026 Informing Consent - All Rights Reserved.

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