You could consider it. I lost my first horse to it after the vet misdiagnosed her. But I live in WI, which I guess is kind of an iffy zone for vaccinating or not... if I were you, I'd ask your vet how many cases you normally get in your area, and go from there.
We're not on the map in my area as a real area where it's present but just this year we had two horses come down with it. There was a third horse that died but in hindsight we believe he died of old age. The other two made it but it was extremely hard to get them well, the only reason that two months went as good as they did was because we vaccinated on a fluke for it (got a few free from a shipping company). Couldn't hurt but your vet would know more.