You've asked a very interesting question. Most breeders have the first vaccinations given to a kitten as there are age-related vaccinations for cats, just like babies.
That being said, would I introduce an unvaccinated kitten to a vaccinated cat? Yes! Most cats are vaccinated for rabies, distemper and FeLV (feline leukemia). The first two are fairly rare these days but FeLV is quite common. If your cat has been vaccinated against these three, it is unlikely to be transmitted to a kitten. And most kittens have an immune system so they do not transmit these diseases to another cat -- the odds are highly unlikely that there would be an issue. The other issue is FIV (Feline AIDS) which has no vaccine or cure and is transmitted through blood and saliva. There is no vaccine that will prevent the transmission of FIV. FIP is a totally different situation which also has no vaccine and no treatment.
HOWEVER, since you appear to be concerned about this, the BEST advice I can give is to contact your vet office and ask their opinion. And know that vaccinations do not take effect immediately!
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