I dont know how much more I can do

I have 4 cats now, I just adopted the 4th who was already taken to the vets yesterday due to a URI. But as I was leaving for work I saw 3 adult cats outside, who I have seen before.
The woman downstairs "might" own them, but she surely doesnt claim to own them.
I was going to call the vet to see if we could take them in to get fixed, just to make sure that problem was ended, before it starts., if there isnt kittens already. Didnt have time to investigate.
Theres 2 boys and 1 female.

Do vets require them to be vaccinated , etc??? to neuter??
I can easily pay for the procedure, but to vaccinate from scratch all 3 is a little steep for my pockets right now. Im still vaccinating 2 kittens I have.
Any help would be appreciated. I just wasnt sure how they do things, since when I do any neutering procedure, I always have had vaccination records...

my first stray kitten had no injections when it was fixed, but i think it may depend on the vet, but i think most will just fix the cats/kittens if your a paying customer and if you tell them of the situation.

Good luck

What about TNR? There is some good info on the forums about this.

Any cats I have had fixed through our TNR or support pay programs have always had a rabies shot as well as being spayed or neutered, but none of the other vaccines. The vets here charge $16 for the rabies shot which not a requirement, but a good idea.