By Dr. Robert Hunter, DVM
Spring is just around the corner and this means trail riding and show season will soon be upon us. For horse owners, this is a time to be reminded that there is always risk when horses of unknown health status are gathered in close proximity.
Special Alert for Participants at Thermal Desert Circuit Show
On March 15, the CDFA reported that two horses have been confirmed positive for the non-neuropathogenic strain of Equine Herpesvirus -1 (EHV-1). The horses were displaying hind limb ataxia and are from Monterey and San Diego Counties. Both participated in the recent Thermal Hunter Jumper Show. If your horse was at this show, please monitor for signs of infection, including high temperature and abnormal behavior. CDFA is working with event management to contact exposed horse owners and recommends isolation, twice daily temperature monitoring and implementation of proper biosecurity.
In January of this year there was an outbreak of EHV-1 at two Southern California stables. According to the California Department of Food and Agriculture (CDFA), 16 horses confirmed positive for the neuropathogenic strain of EHV-1 at a large multi-discipline facility located in Orange County. One confirmed case displayed neurologic signs and all others displayed compatible clinical signs such as fever, nasal discharge, and limb edema. At another multi-discipline facility in Riverside County, one horse was confirmed for the neuropathogenic strain of EHV-1. The horse was displaying severe neurologic signs and unfortunately had to be euthanized.
Everyone will remember last year when several horse events were delayed or cancelled due to the spread of this contagious disease. Horse owners should take the following steps when traveling to equine events:
- Limit direct contact with other horses
- Avoid communal water sources
- Monitor your horse for clinical signs of disease
- Report any temperature over 102 F to your veterinarian
The CDFA has prepared a Biological Tool Kit, which can be accessed at this link. Dr. Kent Fowler, DVM with the CDFA will also be making a presentation on “Biosecurity Measures for Control of Equine Herpes Virus” at the upcoming Horseman’s Day, hosted by Hunter Stallion Station on Saturday, March 24th. This event is open to the public and includes speakers on various topics relating to equine health. Following the presentations will be a free barbeque for all participants to enjoy.
It will only be through the continued effective monitoring by the CDFA, and the protective efforts of horse owners that we will avoid a major outbreak like we saw in 2011. If we all do our part, the only thing our horses will bring home is a blue ribbon or a memory of a nice day on the trail.
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