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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.

Or if you know the Alert ID number, use the filter below

Alert ID: 1202
March 26, 2019
Clark County, NV
Outbreak Update
Source: Nevada State Veterinarian

On Monday, the Nevada Department of Agriculture (NDA) lifted the first quarantine in Clark County and,  provided no additional positive cases of Equine Herpes Virus – Type 1 (EHV-1) are reported, the other two quarantines will be lifted later this week.

Alert ID: 1201
March 21, 2019
Municipality of Big River, SK
Confirmed case(s): Official Quarantine
Source: Canadian Animal Health Surveillance System

Number Affected: 1;
Confirmation Date: 3/18/2019;
Notes: On March 18, 2019, a positive EIA result was confirmed by the CFIA’s national reference laboratory for a horse located on a premises in the rural municipality of Big River, Saskatchewan.The horse had been sampled by an accredited veterinarian at the owner’s request after they became aware of a potential epidemiological link to a recently identified EIA-affected premises. No clinical signs of disease were noted at the time of sampling. As per program policy, a quarantine has been placed on the infected horse and its on premises contact animals. The quarantine will remain until all disease response activities have been completed, including follow-up testing and ordering the destruction of positive cases. Trace-out activities may require the CFIA to undertake actions at additional premises as outlined in the current policy.;

Alert ID: 1200
March 20, 2019
Lowndes County, GA
Confirmed Case(s): No Quarantine
Source: Georgia Department of Agriculture

Number Affected: 1;
Age: 3; Breed: Miniature Horse; Clinical Signs: Acute Onset, Neurological Signs; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;
Notes: The horse is recovering with supportive care. The 2019 total reported EEE cases in GA to date are 1 confirmed.


Alert ID: 1199
March 19, 2019
Clark County, NV
Outbreak Update
Source: Nevada State Veterinarian

Two additional cases of EHV1 have been confirmed in Clark County, Nevada. These two cases have resulted in two additional premises being quarantined. Nevada State Veterinarian has requested that all equine events in Nevada be postponed or canceled for this upcoming week. Additional exposure may have occurred at a rodeo in Fernley March 8th-10th. All horse owners are urged to not travel and to monitor horses for fever and other signs of disease over the next two weeks.

Alert ID: 1198
March 15, 2019
Clark County, NV
Confirmed case(s): Official Quarantine
Source: Nevada Department of Agriculture

Number Affected: 1;
Clinical Signs: Neurological Signs 
Notes: Horses at the Nevada State/Junior/High School Rodeo that took place in Pahrump may have been exposed to the virus and should be monitored for signs of disease such as fever, cough or runny nose. For more information go to:

Alert ID: 1197
March 13, 2019
Transylvania County, NC
Suspected Case(s): Official Quarantine
Source: North Carolina Department of Agriculture and Consumer Services

Number Affected: 1;

Breed: Mule; Horse Status: Euthanized;
Notes: The mule displayed clinical signs and at necropsy had histopathological changes consistent for EIA. Additional blood from the animal was not available for testing for EIA, so out of an abundance of caution the case is considered presumptive positive by animal regulatory health officials. The remaining equids at the facility were tested and were negative for EIA and will be observed and retested in 60 days.

Alert ID: 1196
March 13, 2019
St. Lawrence and Livingston Counties, NY
Confirmed case(s): Official Quarantine
Source: New York Department of Agriculture and Markets

Number Affected: Not Reported;
Notes: The New York Department of Agriculture and Markets is investigating cases of Equine Herpesvirus-1 at St. Lawrence University’s horse boarding facility in St. Lawrence County and Leg Up Stables, which is home to SUNY Geneseo’s Equestrian Team in Livingston County. The stables are working closely with the Department and have voluntarily quarantined their animals and proactively instituted biosafety measures.

For more information go to

Alert ID: 1195
March 11, 2019
Williamson County, TN
Confirmed case(s): Official Quarantine
Source: Tennessee Department of Agriculture

Number Affected: 4;
Notes: The Tennessee Department of Agriculture has confirmed that four horses returning from out-of-state events have tested positive for equine influenza virus (EIV) in Tennessee. All of those horses are from Williamson County in Middle Tennessee, but they are not all from the same barn. They all have been isolated to prevent further spreading of EIV. For more information go to


Alert ID: 1194
March 07, 2019
Miami Animal Import Center, FL
Information Only
Source: Animal and Plant Health Inspection Agency

After completing a thorough cleaning and disinfection, USDA’s Animal and Plant Health Inspection Service (APHIS) will partially reopen the Miami Animal Import Center’s (MAIC) horse quarantine facility on March 11, 2019. On January 19, 2019, the facility was closed to new arrivals, after eight horses became sick between December 17, 2018, and January 25, 2019. All eight showed signs of lameness and received immediate medical treatment. Four of the horses died and the other four recovered. On January 16, 2019, APHIS announced the temporary closure of the MAIC as a precautionary measure, but horses under quarantine were allowed to complete their stay at the facility. At the time, veterinary experts suspected salmonella as the cause of illness, however, subsequent testing has not identified any causative disease agent present in the Center. APHIS officials took more than 180 environmental samples at the facility and all were negative for salmonella. In addition, affected animals were tested for a variety of diseases, such as E. coli, Equine Influenza, Equine Herpesvirus, Aeromonas caviae, Torovirus, Coronavirus, Lawsonia intracellularis, Neorickettsia risticii, and Clostridium ssp and toxins. The tests did not pin point the causative agent.

Alert ID: 1193
March 06, 2019
Snohomish County, WA
Confirmed Case(s): Voluntary Quarantine
Source: Washington Department of Agriculture

Number affected:1

Age: 11; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 3/1/2019;
Clinical Signs: intermittent fever; Confirmation Date: 3/5/2019; Horse Status: Recovering; Vaccination Status: Vaccinated;