I do three separate vaccination visits for my horses. They get the four way tetanus/ewe vaccine on one day in April. Then two weeks later they get WN and PHF. Then in the fall, Oct-Nov, they get rabies.
I started PHF when they boarded one field away from a swamp and as it is inexpensive it is as easy to continue as it would be to do the vac plus booster series should I happen to move them near a swamp again.
The rabies is not a flybourne disease, so it’s done in the fall. Tetanus isn’t flybourne either, but it’s in with the flybourne diseases in the combo.
Coggins is, of course, a blood draw and test, not a vaccine. In actual fact the so called “Coggins” is no longer used. Coggins is the name of the test use to check the blood for Equine Infectious Anemia, or Swamp Fever, and is no longer used in most places as the “Elisa” test is more accurate. Check your bit of paper - they’re usually stamped “tested by ELISA”.