West Nile Virus vaccine could certainly be taken out of one's regimen if there were problems with it unless you are in a high risk area. If equine rhinopneumonitis were causing abortions, then it would be a necessary vaccine. Vaccine protocols will differ for different situations. For example, horses that are totally isolated may not need much beyond tetanus and eastern equine encephalitis (or which ever one is common in their area.) I would think that your veterinarian will be able to determine whether rhinopneumonitis caused your problem, and if it did, recommend the best course of action in the future.
I like to give tetanus vaccine in the last month of pregnancy because it can protect both the mare and the foal.
Last edited by Celeste; 11-14-2012 at 10:06 PM.