November 2018 Equine Disease Alerts - EIA Colorado, EHM CA A Weld County veterinarian initially tested the horse's blood as part of a buyer's pre-purchase exam for a Coggins. (stock photo)

November Equine Disease Alerts

update November 30, 2018


EIA Confirmed in Alberta Horse

Athabasca County, Alberta, Canada

November 30, 2018


The Canadian Food Inspection Agency confirmed a horse is positive with Equine Infectious Anemia in Athabasca County, Alberta. The horse didn’t show clinical signs of the disease when blood was pulled. The CFIA is investigating. The agency quarantined the property and all horses residing there.




EIA Outbreak Continues in Texas 

Kaufman, Tarrant, Tom Green Counties, TX

November 15, 2018


Texas officials confirm a Kaufman County horse is positive with Equine Infectious Anemia (EIA). The state quarantined the premises where the horse resides in June 2018 after two other Quarter Horses tested positive for EIA.

Texas Animal Health Commission (TAHC) officials confirm two more Quarter Horses in different counties also have EIA. One is located in Tarrant County while the other is in Tom Green County. Veterinarians euthanized the EIA positive horses. Additionally, the premises are under quarantine until each meets the requirements for release.

EIA is an often fatal disease that affects horses, donkeys, and mules. No other animals or humans can contract the virus. Symptoms include fever, depression, weight loss, swelling, and anemia.

A Coggins test is utilized to determine the presence of EIA. Under Texas law, any horse over 8 months old traveling to an event, being sold or entering the state must have a negative Coggins within the last 12 months.

The Texas EIA outbreak started in March.



update November 9, 2018


EHM Confirmed in California Mare

San Mateo County, California

November 7, 2018



California officials confirm a San Mateo horse is positive for Equine Herpesvirus Myeloencephalopathy (EHM). Veterinarians are treating the 24-year-old Arabian off-site in an isolated quarantine.


EIA Positive Leads to Alberta Quarantine

M.D. of Bonnyville, Alberta, Canada

November 7, 2018



Canada officials report an Alberta horse headed to the United States has been confirmed positive for equine infectious anemia (EIA). A veterinarian tested the horse’s blood in compliance with U.S. import regulations.

In the end, the horse didn’t travel from its premises located in M.D. of Bonnyville. Despite a test confirming EIA, the horse isn’t showing signs of illness, which isn’t uncommon.

The Canadian Food Inspection Agency placed the property under quarantine. Several other equines reportedly live there as well. The agency is conducting a full investigation.





publish November 7, 2018


EIA Positive Colorado Horse: Location Unknown

Weld County, Colorado

November 6, 2018


Colorado officials confirm a third horse is positive with equine infectious anemia (EIA) although its location is unknown. 

A Weld County veterinarian initially tested the horse’s blood as part of a buyer’s pre-purchase exam.

The Colorado State Veterinarian’s office adds that the horse may have participated in unsanctioned horse racing events. The investigation is on-going although the state maintains this case of EIA “appears to be unrelated to the prior two cases of EIA in Colorado this year.”

Additionally, the state’s investigation includes information about the horse’s location.


Weld County EIA update

In late August, Colorado began an investigation into 240 horses exposed to an EIA positive horse that originated from Fabrizius Livestock’s Weld County kill pen. Colorado released the index location and two associated properties.

The state located 149 exposed horses at 66 locations across Colorado. To date, officials have lifted 50 hold orders. These counties still have 16 holds among them: Adams, Arapahoe, Boulder, Douglas, Elbert, Huerfano, Jefferson, Larimer, Phillips, and Weld.

Despite the fact every horse must have a negative EIA test called a Coggins to cross state lines, horses shipped illegally into other states without a Coggins.

Colorado State Veterinarian Keith Roehr, DVM told us in September that EIA exposed horses shipped to 20 states nationwide. To date, 12 states have located 76 horses exposed to the index horse from the kill pen, which was euthanized. Before that happened, it was shipped illegally from the kill pen to Wyoming and back to Colorado.

A second index location with an EIA positive horse, also in Weld County, remains under quarantine.


Swamp fever

Swamp fever is a viral disease that attacks the horse’s immune system. There is no cure or vaccine to prevent EIA.

Biting insects, primarily horse, and deer flies transmit the disease. Although, it can also spread through the shared use of infected needles on horses.

An EIA horse may carry the disease without symptoms for years or they may become acutely or chronically infected. Signs of the disease include fever, depression, anemia, and dependent edema, sometimes progressing to loss of condition, lethargy, and anorexia.

To help prevent the disease, veterinarians recommend insect control, good sanitation, testing new horses with a Coggins test before bringing them onto your property, and quarantining new horses for 45 days.

Additionally, when planning travel to horse shows or events, go places that require a negative Coggins. Furthermore, you want organizers to check all horses’ paperwork before allowing animals off the horse transport.

Stay with us for this and other equine disease alerts!