Indiana reports EHM case in Elkhart County horse
Bottom line
An Indiana horse has tested positive for equine herpesvirus myeloencephalopathy, or EHM, at a private facility in Elkhart County. The Horse, citing Equine Disease Communication Center data sourced from the Indiana State Board of Animal Health, reported that the case involves a 2-year-old draft stallion that tested positive on April 17 and is now under quarantine. Two additional horses are considered suspected positives. Indiana classifies EHM as a reportable disease, which means veterinarians and laboratories must notify the state within 24 hours. (thehorse.com)
Why it matters: For equine veterinarians and ambulatory teams, the case is a reminder that a single neurologic EHV-1 diagnosis can quickly become a facility-level biosecurity event. EHV-1 spreads through close horse-to-horse contact, contaminated equipment, and people’s hands or clothing, and infected horses may initially show only fever before neurologic signs develop. Indiana officials and equine industry guidance continue to emphasize movement restrictions, quarantine, hygiene, disinfection, and close monitoring of exposed horses, particularly because currently available vaccines may reduce shedding but aren’t labeled to prevent the neurologic form. (thehorse.com)
What to watch: Watch for updates on whether the two suspected horses are confirmed, whether any additional exposed horses are identified, and how long quarantine measures remain in place. (thehorse.com)
A 2-year-old draft stallion in Elkhart County, Indiana, has tested positive for equine herpesvirus myeloencephalopathy, adding a new EHM case to a state that has dealt with prior EHV-1 neurologic activity. The horse, housed at a private facility, tested positive on April 17 and has been placed under quarantine. Two additional horses are listed as suspected positives, according to The Horse’s EDCC Health Watch report, which cites the Indiana State Board of Animal Health as the source. (thehorse.com)
The case lands against a familiar backdrop in Indiana. In March 2024, the Equine Disease Communication Center reported that horses on four private premises in Elkhart, LaGrange, and Kosciusko counties were placed under official quarantine after confirmation of EHV-1 in horses showing neurologic signs. That earlier cluster involved six confirmed cases, underscoring how quickly EHV-1 concerns can spread across connected facilities and counties when horse movement and shared contacts are involved. (equinediseasecc.org)
The newly reported Indiana case appears limited, for now, to a private facility. Still, the details matter. EHM is the neurologic manifestation associated with EHV-1, and The Horse’s report notes that the infected horse is quarantined while two more horses are under suspicion. Indiana lists EHM as a reportable disease, requiring notification to the State Veterinarian within 24 hours of diagnosis or identification of clinical signs. That reporting framework is designed to trigger faster state involvement and help contain spread before a single case becomes a broader outbreak. (thehorse.com)
State and industry guidance make clear why practitioners take these cases seriously. Indiana BOAH says horses exposed to EHV-1 should be closely monitored and that restricting movement and contact can greatly reduce spread. BOAH also notes that EHV-1 is common in the horse population and often first appears as mild respiratory disease, while the less common neurologic form, EHM, can present with decreased coordination, urine dribbling, loss of tail tone, fever, hindlimb weakness, lethargy, and inability to rise. The Horse similarly notes that fever may be the first or only early sign, which raises the stakes for prompt temperature monitoring and isolation protocols at barns with exposed horses. (in.gov)
On prevention, the message from regulators and equine groups is consistent: biosecurity does the heavy lifting. BOAH advises quarantine of new or returning horses and warns that even horses without obvious illness can shed virus. AAEP’s vaccination guidance says there are currently no licensed vaccines labeled for prevention of neurologic EHV-1, though some products may help reduce nasal shedding and viremia. In practice, that means veterinarians are still leaning on isolation, traffic control, dedicated equipment, hand hygiene, and careful communication with trainers, barn managers, and pet parents when a suspect neurologic case appears. (in.gov)
Why it matters: For veterinary professionals, especially equine practitioners, this is less about a single positive horse than about the operational consequences that follow. A confirmed EHM diagnosis can halt horse movement, trigger testing and monitoring of exposed animals, and create urgent demand for client guidance on quarantine, cleaning, and event participation. It also reinforces the need for practices to have a ready-to-use EHV response plan, including scripts for client communication, temperature-monitoring protocols, and criteria for escalating suspect cases to state officials. Because vaccines don’t reliably prevent the neurologic form, early recognition and rigorous biosecurity remain the most practical tools for limiting downstream spread. (thehorse.com)
What to watch: The next key developments are whether the two suspected horses are confirmed, whether BOAH identifies additional exposed horses or linked premises, and whether the case remains contained to one private facility or expands into a wider regional response. (thehorse.com)