11/20/2025
I would say a majority of my show clients do a wonderful job of annually vaccinating their horses, although some do not booster.
Please read Dr. Katie Sisk’s post about the rhino/flu vaccine.
In SW Missouri, specifically, a large majority of our clients do NOT do a great job vaccinating their horses. It is so important, especially if you travel regularly or live at a boarding barn to administer a flu rhino vaccine every 6 months.
Most people are not aware that EHV-1 is one of the herpes strains covered by the rhino portion of your flu rhino vaccination. Now there is no vaccine for EHM, however boostering a flu rhino vaccination in the face of an outbreak (even if your horse already received a fall flu rhino) helps to increase the antibodies in their nasal mucosa, which enables their body to better defend itself if confronted with the virus.
For this reason, we are are recommending boostering all horses with a BI vaccine called Calvenza. $35 per dose and if a veterinarian administers the vaccine the company stands behind the product with a vaccine assurance that if a horse should contract EHV-1 (resp strain) or EHV-4 the company will assist with the costs of diagnostics and treatment. This assurance does not cover horses with EHM (neurology).
Dr. Noblin said it best:
“I know “EHV-1” has been a pretty big buzz word on the internet over the last 24-48 hours but just a reminder that this is also known as “Rhinopneumonitis.” You may hear your vet talk about a “rhino/Flu” or “rhino” or “flu vac” vaccination for horses that will be exposed to other horses. The goal of the vaccine when administered appropriately, (meaning getting boosters initially and then annually to biannually thereafter) is to decrease the risk of spread and reduce viremia. While no vaccine has 100% efficacy, I wanted to ease the minds of some folks minds that their horses may already have some protection. Ultimately I am posting this to say: check with your vet to understand what your horses are being vaccinated for. Now would be a good time to booster the rhino/flu vaccine and/or add it to your vaccine program.
I am not posting this to downplay the severity of the outbreak. Just hoping to clarify the different names of the disease and vaccines against it.”
Check out this link for more info on BI’s assurance program:
https://docs.boehringer-ingelheim.com/Vaccines_Assurance_Detailer.pdfnc