I'm in the South and was wondering how often most people do the EWT and Flu/Rhino?
My current BO only does them annually and the label on the bottle says annually, but my vet and former barn does Spring and Fall.
Why or why not do you vaccinate annually or bi annually?
EWT in the late spring, but we have a relatively short mosquito season. If I lived in an area where there were insects nearly year-round, I'd probably do spring and fall. Rhino/Flu in the fall, routinely, but more often if I have a broodmare on the place: routinely and at 5, 7, and 9 months of gestation.
I do the PHF vaccine twice a year since it is very prevalent here the last several years. Incomplete protection, but IMO (and my vet's) better than nothing.
The immune titre starts to drop after awhile. In an area where mosquitos fly all year, and encephalitis is a full time resident, twice a year vaccinations make sense.
Up here, the season starts in late July, and is usually done by Nov., so a once a year vaccination in late April or May is sufficient. There is tho, an unfortunate tendency for people to "get it over with", way too early in the year, like Jan or Feb.
As DW says the other vaccines need to be tailored to your individual situation.
Some riders change their horse, they change their saddle, they change their teacher; they never change themselves.