O.K. Getting ready to vaccinate. 5 way, WNV, and rabies. Do all at once? Not comfortable with this idea. Saw a friends horse go down one year when the vet gave her horse all of it's shots the same day. His immune system became compromised and he contracted leeches or Pythiosis a month later. Both this horse and it's pasture mate were in the same pond but only my friends horse contracted the bacteria. Now, I'm scared to give all the shots at once. Any information on this??