Is that true?
No, that is NOT fact/true/reality.
Did you actually speak to your Veterinarian, or to one of the staff?
Veterinary staff are not all technically trained; some are administrative 'types', and at times, by necessity, must step over their areas of expertise...but, my expectation would be that, before they do, they refer technical questions to technically-knowledgeable colleagues or ask, etc.
Other Veterinary staff have technical training - usually to varying 'levels' - and, even then, you may get different answers from different staff for many different reasons (they think they know but do not, they stretch their knowledge base and reply because they think they have to or because they believe their answer is 'logical', etc etc)
Now, if that answer came from a DVM.........I'd say "Time to find a competent Veterinarian!"
cat owner again
, all feline vaccines come in both adjuvanted and non-adjuvanted forms - and all of those with the single exception of the rabies type, are made by a number of manufacturers. The rabies type - in the non-adjuvanted form, is only manufactured by one company (Merial) and had the brand name PUREVAX. ALL other brands of feline rabies vaccine by ALL other manufacturers ARE ADJUVANTED.
Should you worry?
Well, as I said above, IF that statement came from a real DVM, I'd be concerned enough to look for a competent cat Vet......after I had spoken to that person in-person and clarified/confirmed what had been said - I mean, for a million reasons they may have misunderstood the question.
Meantime, Dr. Pierson's advice to "Never assume" and ALWAYS ASK BEFORE the vaccine is given should keep you worry-free. Lisa A. Pierson, DVM :: Vaccines are very important but do carry risks