Okay adding my two cents. I have 7 cats. All of them have received or are receiving the kitten vaccines. 5 of them get the rabies with no problem. One has to have a shot of benadryl prior to the rabies shot so she doesn't react (high fever, lethargy, lack of appetite and dehydration for a few days otherwise). My last cat is a 12 year old, who about a year and a half ago almost died from an auto-immune issue that just showed up with no warning. The Vets think his shot in April caused the reaction in August/September. So for his health, they won't do it any more. I think it was the diet I was ordered to put him on (18 lb Maine coon mix down to 16 lb.). So, While California requires the rabies, I have gotten a waiver for him. I think the kitten vaccines are important. I also think the Rabies one is important for any cat (even indoor ones) who mouse. Vinnie is having to be protected from that since he no long has protection, so no garage or any other location i think one might show up.