FeLV vaccinations MAY HAVE AN ASSOCIATION with sarcoma formation in cats, i.e. we don't know if they causes it or not, and you can get sarcomas in non-injection sites too. This is not a new issue, and was covered in a Defra report on animals vaccination a little while ago
http://www.noah.co.uk/papers/vpc-catdogvetsurv.pdf
The figures from the USA quote a sarcoma rate of 1:1000 to 1:10,000 depending on what report you read. This is higher than the UK rate of 1:265,000 because it includes rabies vaccinations as well as FeLV vaccinations. Rabies vaccinations are known to cause a greater inflammatory response, and the assocation is thought to be linked to the aluminium based adjuvant used in the vaccine.
Overall, the tiny risk of an adverse reaction to any given vaccination is minute compared to the risk of not vaccinating your cat. I have nursed cats with cat flu and FeLV and it's heartbreaking
I have all of my cats vaccinated, and will continue to do so. As yet, I have not been advised to have the vaccination done in any site other than the scruff, so will contine to be guided by my vet on the matter.
Hope this puts your minds at rest
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