Clara Mason, DVM

44 Cloverleaf Street
Winfield, WV 25213


                                                          First Equine Leptospirosis Vaccine Introduced

At a panel discussion held Oct. 8 in Lexington, Kentucky, Zoetis introduced its new Lepto EQ Innovator vaccine against equine leptospirosis, which can cause abortion in pregnant mares, kidney and liver failure, and equine recurrent uveitis (ERU, the most common cause of blindness in horses). This is the first USDA-approved, equine-specific vaccine labeled to help prevent leptospirosis caused by Leptospira pomona.

Horses become infected with Leptospira bacteria when it enters the body via mucous membranes or wounds. Carrier hosts, such as rodents, wildlife, and domestic animals, spread the bacteria in their urine, which horses can come in contact with when it contaminates water or soil. Infected horses also shed the bacteria in their urine, which can lead to leptospirosis outbreaks on farms. The disease is zoonotic, meaning it’s transmissible to humans.

The development of a vaccine against the serovar Leptospira pomona (which is the serovar most frequently associated with clinical disease in horses in North America) is significant because leptospirosis causes serious and costly health problems in horses. Economic losses from horses with leptospirosis-associated ERU or abortion amount to hundreds of millions of dollars, according to the University of Kentucky Veterinary Diagnostic Laboratory and Poulsen Nautrup et al.

In Zoetis’ efficacy studies, leptospires were detected in 0% of vaccinated horses after being challenged with L. pomona. The company’s safety studies showed the Lepto EQ Innovator vaccine to be 99.8% reaction-free among vaccinated horses.

According to Zoetis, vaccination can help prevent kidney colonization and urinary shedding, which means the vaccine can help prevent contamination of the environment and transmission to other horses, important factors to consider in controlling leptospirosis outbreaks caused by L. pomona.

(copied from The Horse Oct 2015)

**We offer this vaccine beginning in January 2016. Because this is a new vaccine, your horse will need the first vaccination and a booster 28 days later. Due to our higher risk of Recurrent Uveitis (Moon Blindess) in the Ohio Valley, I highly recommend this vaccination for most horses.