Thanks everyone. There wasn't really a place to check for vaccinations, it was a rubber stamp across the certificate.
The birth certificate is my own. We've moved since I last used it (two years ago) but I'll find it and scan it or at least post the EXACT wording. The last time I used it was to get my driver's license and the folks at the DMV were kidding me about being vaccinated against REGRETS.One asked me if I ever had any regrets and when I said no, she said "see? it worked!"LOL
We lived in a very small town (about 500 people, all relatives) and it was a home birth. This might just remain one of life's little mysteries but I'm going to keep trying to figure it out.