Oops. Thanks xpButtercup!
The vaccine link was great. I actually called a vet today who specializes in birds to ask about vaccines. They don't carry them but told me to call UCONN. (go Huskies!)
The guy at UCONN told me the same thing that the article said. He didn't seem to worry about vaccinating. I have a small flock of 5 chickens and 5-7 chicks. I don't plan to show them.
He did mention that if I 'hang out with other flocks' that I should treat myself as a possible hazard. Wash self, clothes, etc before handling my own chickens. I was kind of giggling about hanging out with other flocks, but then he explained that included visiting the local fair, etc.
He wasn't ruling out the possibility of anything happening to my chickens, but said that my chances of a problem are extremely low. I guess I'll pass on the vaccines.