Real Rider Resource
Equine Infectious Anemia is a blood-borne viral disease with no treatment or vaccine. For riders, the practical priorities are current testing, clean equipment, verified travel rules, insect management, and prompt veterinary guidance.
Current alerts | August 28, 2026
Santa Clara County, California: The Equine Disease Communication Center reported that quarantine was released after all 50 potentially exposed horses tested negative on the 60-day retest. Six confirmed horses had been euthanized.
Clark County, Nevada: A separate private premises remains under official quarantine after three confirmed horses were euthanized. The two remaining cohort horses must be retested and confirmed negative before quarantine can be released.
These reports involve different premises and do not establish a shared exposure.
Rider next step: A released quarantine means the official follow-up requirements for that premises were satisfied. It does not replace current Coggins, destination, event, sale, or boarding rules. For an active quarantine, do not move exposed horses unless animal-health officials authorize it.
Sources: EDCC alert 5178 and EDCC alert 5174. Reviewed August 29, 2026.
A Coggins test screens for EIA. A negative result documents the horse's status at the time of testing, but current movement, event, sale, and boarding requirements still need to be checked before hauling.
Equine Infectious Anemia affects horses, ponies, mules, donkeys, and other equids. It does not threaten human health. Clinical signs can range from fever, weakness, swelling, and anemia to sudden death, but some infected horses show mild, intermittent, or no obvious signs.
Horses that survive infection remain lifelong carriers. That is why a positive result is handled through veterinarians and animal-health officials rather than a wait-and-see barn routine.
EIA moves through infected blood. Biting horseflies and deerflies can transfer blood between equids, but USDA APHIS identifies human-facilitated blood transfer as the most common route in the United States today.
The Coggins test is an official blood test used to detect antibodies associated with EIA. Your veterinarian collects the sample and handles the documentation. A recently infected horse may not test positive immediately, so exposure questions and test timing belong with your veterinarian and state animal-health officials.
USDA APHIS recommends annual EIA testing, but legal and facility requirements can vary. Verify the rules for the destination, event, sale, boarding barn, and states involved before you load the trailer.
For the rest of your show-day paperwork and packing routine, use the Show Day Prep Guide.
Stop nonessential movement, separate the horse as directed, and contact your veterinarian and state animal-health officials. Do not move a suspected or confirmed horse to another barn, event, sale, or pasture unless officials specifically authorize it.
There is no vaccine or curative treatment for EIA. Positive equids are managed under regulatory direction, which can include permanent isolation under quarantine or euthanasia.
Keep testing current, verify movement rules before hauling, use sterile equipment, reduce biting-fly pressure, and involve your veterinarian early. EIA prevention is a layered biosecurity job, not a product promise.
A Coggins test screens an equid's blood for antibodies associated with Equine Infectious Anemia. Your veterinarian handles testing and documentation.
Yes. Some infected horses show mild, intermittent, or no obvious signs, but survivors remain lifelong carriers and can transmit the virus.
No. Reducing biting-fly pressure is one supporting biosecurity step, but it cannot replace clean equipment, testing, movement controls, quarantine, or veterinary guidance.
Stop nonessential movement, separate the horse as directed, and contact your veterinarian and state animal-health officials. Follow official testing and quarantine instructions.
For more practical biosecurity and emergency education, visit the Horse Health Library.
Educational only. This article does not replace veterinary or regulatory guidance. Testing, exposure decisions, movement rules, and positive-test procedures should be handled through your veterinarian and state animal-health officials.
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