I give a 5 way(for years, I did a 6 way,which included Venezuelan Enceph, ut didn't this year), along with a West Nile(using Prevenile this year).Rabies is not required for horses here, and since it is seldon an issue in this part of the country, I don't vaccinate the horses for it, nor do I know of anyone who does, here. I did order only a three way for the old retired mare this year. I no longer show(except very infrequently), but do occasionally take some of the horses 'out' to trail drives,parades,clinics,and the like, so best to have the protection. If it is later in the season and I plan a trip away, or perhaps, to show somewhere, I can always booster with a rhino/flu at least two weeks ahead of that occasion.
I would never do completely without vaccinating; IMO, the only reason that many of these diseases are infrequent today is that most DO vaccinate.This may 'enable' those who don't/won't vaccinate to 'get by', but eventually, could lead to the reemergence of some very serious diseases. I think it is understood that the very occasional individual may be adversely affected by some vaccine(s),but this can be the case with nearly every generally beneficial medication/preventive, which is of demostrable benefit to the vast MAJORITY!
Little story: Polio was still a serious problem in my youth; where I lived, we had a river 'beach park', enjoyed and beloved by many...but I can also recall the years when we didn't dare use it, out of fear of contracting polio. A good friend's older brother (we were pre-teens, he was a high school sophomore, the same as my own older sister)contracted bulbar polio, suffered in an iron lung, but died anyway. You think I wasn't one of the first in line when the Salk, and later, the Sabin, vaccine, was developed? And my then small children, too?! I caught mumps as an adult, most likely from one of my students(I taught 7th graders at the time)...was hospitalized, for several days...sickest I EVER was in my life, till this day! You think I didn't get the measles/mumps, etc? shot for my kids??
JMHO.
Margo