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Disease Outbreak Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.

Date Disease Location Status
April 21, 2016 Equine Herpes Viruses Howard County, MD Confirmed case(s): Quarantine
Update on the EHV-1 in Howard County, Maryland. The Index case was euthanized because of neurologic signs on 4/18;  Blood and nasal swabs collected on 4/18 tested positive for EHV1 non-neuro strain, which can cause neurologic disease. The second case presented with a fever of 104.7 on 4/19; No neurologic signs were noted on examination on 4/19.  Nasal swabs collected on 4/19 were positive for EHV1 non-neuro strain and blood was negative.  This horse was euthanized for other reasons. The third horse presented with a temperature of 102.7 on 4/20.  Neurologic exam was normal.  He tested negative for EHV1 on nasal swabs and buffy coat on 4/20. Forty-five horses remaining on the premise are being monitored for fevers and/or neurologic signs.  The quarantine will remain in place for 30 days from the last clinical case. Go To: and
April 21, 2016 Equine Herpes Viruses Howard County, MD Confirmed case(s): Quarantine
ANNAPOLIS, MD – A horse stabled in Howard County tested positive for the non-neuropathic form of Equine Herpes Virus (EHV-1) and was euthanized by a private veterinarian. Diagnosis was confirmed on April 18 by the Maryland Department of Agriculture Frederick Animal Health Laboratory. The farm is presently under a 30-day investigational hold and strict biosecurity measures are in place while Department of Agriculture inspectors perform additional epidemiological and infectious disease testing. Stables near the one where the sick horse resided are being notified of the situation and owners are cautioned to monitor horses at their premises carefully. The Department of Agriculture’s Animal Health Program is monitoring the situation closely. Go to:
April 21, 2016 Equine Infectious Anemia Halifax, Dauphin County, PA Confirmed case(s): Quarantine
Harrisburg, PA - The Pennsylvania Department of Agriculture today announced a quarantine of an equine barn in Halifax, Dauphin County, after a horse at the barn tested positive for Equine Infectious Anemia (EIA) on Monday, April 18. There are 19 other horses quarantined on the premises as part of the quarantine order. The EIA-positive horse had a routine health check, which included a Coggins test for EIA, less than a week after the horse moved from another barn elsewhere in Dauphin County. The horse was stabled previously at an equine farm in Williamstown, Dauphin County, where another 13 horses are also under quarantine. The department is in the process of tracing the positive horse’s movement history. The barns and horses are quarantined for at least 60 days. The quarantine can be lifted after the remaining horses are determined not to be infected. Go to:
April 19, 2016 Equine Herpes Viruses Fonner Park, Grand Island, NE Confirmed case(s): Quarantine
LINCOLN – Three cases of the Equine Herpes Myeloencephalopathy (EHM) have been confirmed at Fonner Park in Grand Island. Samples were collected and sent to the National Veterinary Services Laboratory in Ames, Iowa, where the disease was confirmed. One of the affected horses was euthanized on site while the other two have been isolated on the premises. The Nebraska Department of Agriculture in cooperation with Fonner Park management has quarantined the horses located at Fonner Park. Horses located in the Red Barn (where the affected horses were stabled) will not be allowed to race at present time. Racing will continue at Fonner Park with the horses located in the other barns on the premises.
April 18, 2016 Rabies Nogales area, AZ Information Only
(Phoenix) The Arizona Department of Agriculture confirmed today that a domestic horse owned in the Nogales area tested positive for rabies. The horse was hospitalized but did not respond to treatment and was later euthanized. Cattle and horses should be vaccinated annually to protect against rabies. Go To:
April 14, 2016 Equine Herpes Viruses Parx Racetrack, Bensalem, PA Confirmed case(s): Quarantine
A horse in the second quarantined barn has tested positive for EHV-1. The quarantine remains in place.
April 14, 2016 Eastern Equine Encephalitis Polk County, FL Information Only
A new case in Polk County has been confirmed with EEE. The eighteen month old, unvaccinated Quarter Horse had not been off the property in at least 6 months. Clinical signs began April 4th and the horse passed on the same day. The case was confirmed positive on April 14th. This is the first confirmed case in Polk County and the first positive in Florida since the beginning of the year. Go To:
April 10, 2016 Equine Herpes Viruses Parx Racetrack- Bensalem, PA Confirmed case(s): Quarantine
To date (April 10, 2016) four horses in the PARX EHV-1 outbreak have either died or been euthanized, including the index case that was treated in isolation at a New Jersey equine clinic and two positive horses that were removed from the exposed barn to an off-site isolation barn and another horse that developed clinical signs of EHM at PARX.
April 10, 2016 Equine Herpes Viruses Parx Racetrack- Bensalem, PA Confirmed case(s): Quarantine
As of Wednesday afternoon (4-6-2016) there were 3 positive horses confirmed in the original exposed barn at PARX. Arrangements were underway to find isolation facilities to move the positive horses to, then start a 21 or 28 day monitoring period for clinical signs in the remaining exposed, asymptomatic horses. A horse that moved earlier from the original exposed barn to a second barn is now considered suspicious. The second barn is under quarantine. At his point 2 barns are quarantined at PARX with one containing three positives. Daily monitoring of all horses in the quarantined barns is ongoing.
April 02, 2016 Equine Herpes Viruses Bucks County, Doylestown, PA Quarantine Ended
44 horses were released from quarantine at the Bucks County boarding facility (unrelated to the Bucks County racetrack) today based on no new clinical signs of EHV-1 in any horse there since February 10 and negative RRT-PCR tests on whole blood and nasal swab samples for all 44, with previously positive horses testing negative twice at least a week apart. Three clinically recovered horses remain in quarantine in an isolated area of the property.