An upper respiratory tract infection or “cold” in a horse, like in a human, can be caused by many different viruses or bacterial infections—adenovirus, herpesvirus (Type 1, 2, 4, 5), influenza virus, rhinitis A or B virus, Strep equi (“Strangles”)—or even a combination of these agents.  Horses can be vaccinated against some respiratory pathogens, namely herpesvirus Type 1 and 4, Influenza, and Strangles, but many other viruses especially are not included in the routine vaccinations (much as humans can be vaccinated against influenza but not the common cold).  Additionally, each horse’s immune system will respond differently to a given vaccine, and a small percentage of horses will be “non-responders.” These horses do not mount an adequate immune response following even properly administered vaccinations.  If your horse develops an upper respiratory infection even when they have received their yearly vaccinations, they could be infected by one of these other viruses (adenovirus, other herpesvirus types, rhinitis virus), or their immune system simply did not respond to the vaccine as well as some other horses.

Of all the vaccines designated as “core” by the American Association of Equine Practitioners, vaccination against tetanus is considered the most basic for all horses, whether they are athletic competitors, companions, retired, young or old.  Why is this?

With the exception of Strangles, all our commonly used equine vaccines are given intramuscularly.  Rabies must be administered by a veterinarian, so it cannot be dispensed for owners to give, however the others can be dispensed.  A note of caution, however—any vaccine can produce immediate, unpredictable adverse effects such as hives or anaphylaxis, which can be fatal if not treated promptly.  If a veterinarian is administering a vaccination, they are required to have medications on hand that can address these concerns.  If administering a vaccine yourself, monitor very closely for signs of these adverse effects and have a plan in place for prompt treatment.

              What vaccinations your horse receives should be dependent on their specific risk of exposure to given diseases.  For horses that do not travel to other barns, shows, or arenas, and do not mix with other populations of horse, vaccination against respiratory pathogens that are passed from horse to horse such as herpesvirus, influenza, and Strep equi (“Strangles”) is probably not necessary.  However, not all diseases that are commonly vaccinated against do not pass from horse to horse.  The bacterium that causes tetanus is ubiquitous in the soil, and enters the body via wounds—no contact with other horses is necessary to be afflicted with tetanus.  Other diseases can be spread by blood-sucking insects, namely West Nile Virus and Eastern and Western Equine Encephalitis (EEE/WEE).  The source of the virus that the mosquitos carry is not other horses, but rather wild birds.  Finally, rabies virus is found in the saliva of an infected animal, and is usually spread by bite wounds from infected bats, skunks, raccoons, foxes, or other infected animals.  Although a “pasture ornament” may not require all the same vaccines as an actively competing show horse, we still recommend that they are vaccinated against these diseases that are not spread by horse to horse contact—tetanus, West Nile virus, EEE/WEE, and potentially rabies.

What is in a “3-Way” vaccine?  A “4-Way?” “5-Way?” “6-Way?”

              We get a lot of questions about these confusing terms!  The “3-Way” vaccine has long been used to describe the combination vaccine containing Eastern Equine Encephalomyelitis (EEE), Western Equine Encephalomyelitis (WEE), and Tetanus.  For a “4-Way,” add influenza to those three vaccines just listed.  A five way provides protection against EEE, WEE, Tetanus, Influenza and Equine Herpesvirus (“rhinopneumonitis”), and a “6-way” contains all 5 components of a 5-Way, plus West Nile.  Although there is a combination vaccine that includes EEE, WEE, tetanus, and West Nile, the combination of EEE,WEE, tetanus, and influenza was on the market for years prior to the introduction of the combination with West Nile, so the “4-Way” term is usually reserved for the vaccine containing influenza and not West Nile.  Clear as mud?

Contact the clinic and we can help you determine what vaccinations are appropriate for your horse.  Stay tuned in the coming days for more information on these diseases and why we vaccinate against them, as well as more answers to your frequently asked vaccination questions.

We hope everyone enjoyed our Focus on Lameness Evaluation seminar on March 24, 2015! If you missed the presentation or want a second look, download the slides from the section on wireless inertial sensor based evaluation by the Equinosis Lameness Locator. Videos are coming soon!

Whether this is your first adventure into the world of mares and foals, or you have been down this road before, you may be wondering what happens between the time you say your farewells at the clinic and the time you get that wonderful news. Well, wonder no more! In this article I will explain all of the techniques, technologies, and tricks we have at our disposal to make the process as reliable and smooth as possible.

The staff of Burwash Equine Services, Ltd. enjoyed an evening of education last night courtesy of Vetoquinol and Dr. Ela Misuno.  Dr. Misuno is a board certified internist with an interest in parasitology and the problem of emerging resistance in this field.  She gave a fantastic presentation with all of the latest updates and recommendations for deworming our equine friends.  I have summarized her recommendations below.

Dr. Kirby Penttila reviews Corynebacterium pseudotuberculosis (pigeon fever) and other infectious diseases of concern this year.

Dr. Brettly Battistone covers what you need to know to make the best decisions for your mare and future foal.

We can start freezing a stallion’s semen as soon as he is sexually mature. For most horses this is any time after 4 years old, but some horses mature earlier or later than others. If your horse is not mature at the time of collection we will be able to see signs of immaturity when examining the sample under the microscope.

It is important to know that every stallion freezes differently, and freezes better in different agents. There are a variety to choose from, and so before performing a commercial freeze, a collection will be “test frozen” with a variety of different agents in order to determine the best agent for your stallion.

Dr. Crystal Lee will give an overview of the most common ophthalmic diseases we see in horses, what to expect in an ophthalmic exam, and how to determine if your horse's condition is an emergency.