My vet told me either last year or the year before they are working on a 3 yr rabies vaccine that is non adjuvant, but it is not ready yet. Or at least it wasn't a few months ago.
State law in NC requires rabbies vacine. The ONLY way to not have to get a cat (even an indoor only cat) vacinated is they have to be on the medial exemption list. My oldest cat due to all her health issues was very close to getting put on that list. She's finally doing pretty well at this point. This particlar one only gets rabbies, she doesn't get anything else, the other two get distemper shots as well.