Hi Craftlady! Yup, I knew about that. There has to be a state OK for that.

I live right on the border, Rhode Island / Massachusetts. I live in RI, my vet is in Mass. Mass. recognizes the 3 year vaccine, RI does not. The old vaccines which my vet offered, it was the same vaccine. Just good for 3 years if you (and your cat) lived in Mass., good for 2 years if you lived in RI.

If you look at the Merial web site, the manufacturer of the Purevax, it is only good for one year.