This doesn't sound right to me. I've never had a vet suggest that a horse with a cut should be given anti toxin if its tetanus jab is over a year old.
Also in humans, there is lifetime immunity after 5 jabs and the NHS won't give you more.
It's not like flu, it's a bacteria not a virus, and there are some (one?) tetanus jabs with 3 year interval and I've heard it said that three years may effective for all of them.
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I double checked and was told this is correct by my vet.
It doesn't mean the tetanus vaccine doesn't work but if you have an accident post 12 months, anti tet will be advised. I'm guessing immunity must wane after a period of time and maybe not give optimal cover after the first 12 months - I'm not saying it doesn't offer some protection still but why the anti-tet if you're within the 2 years?
So in my view, what is the point in having it every 2 years when the anti-tet is more expensive than the booster itself.
I now have mine done yearly to avoid this.
I'm not aware of a 3 yearly vaccine, I always had the bi-annual booster, until I discovered this.
I appreciate its a bacteria, not a virus, but I do think we're led to believe lots of things around vaccines where there are huge grey areas!
Edited to add - I'm not with that vet anymore but will check with my current vet to see what they say.