EIA and Coggins Test Requirements in Oregon: What Every Horse Owner Needs to Know

Equine Infectious Anemia is one of the most tightly regulated horse diseases in the United States, and Oregon enforces its own set of rules that go beyond the federal baseline. Whether you ride recreationally, compete, breed, or haul horses across state lines, understanding these requirements protects your animals, your neighbors’ herds, and your legal standing as an owner.

Oregon’s rules cover which animals must be tested, how often, what testing methods are approved, and what happens when a horse comes back positive. The consequences of non-compliance range from forced quarantine and fines to the potential loss of an animal. Reading through the regulations before you travel or purchase can save you from a costly and heartbreaking situation.

If you own or manage horses in Oregon, this guide walks you through every layer of the state’s EIA testing framework — from the science behind the Coggins test to the disposition options available after a confirmed positive result.

What Is Equine Infectious Anemia (EIA) and Why It Is Regulated in Oregon

Equine infectious anemia (EIA) is a viral, and sometimes fatal, disease that only affects equids — horses, ponies, zebras, mules, and donkeys. The causative agent is Lentivirus equinfane, a retrovirus that shares structural similarities with HIV in humans. It is not a threat to human health.

Blood-feeding insects transfer the virus from an infected animal to nearby uninfected animals while feeding. The most efficient transfers involve horseflies, deer flies, and to a lesser extent stable flies. The virus can also spread through contaminated needles, syringes, dental equipment, or surgical tools — a route known as iatrogenic transmission.

Once infected, horses will remain lifelong carriers of the virus. There is no cure for EIA. Although many infected horses show no symptoms, they remain contagious for life, endangering the health of other horses. Clinical signs range from mild to severe and appear within a few weeks after infection. However, it may take 60 days or more for the horse to test positive.

Efforts to control EIA in the United States started in 1972. Since then, the estimated national prevalence of EIA infection in the U.S. equine population has dropped from nearly 4 percent in 1972 to 0.004 percent. Oregon plays an active role in maintaining that low prevalence through mandatory testing and strict movement controls.

Although EIA is considered a rare disease, at least 15 cases were reported in 2015–2016 in Washington, Oregon, and Idaho. This resurgence in cases caused these states to once again require a Coggins test before entering a different state. That history explains why Oregon’s current rules are stricter than they were a decade ago.

Key Insight: EIA is a reportable animal disease in all U.S. states. If you suspect a horse may be infected, contact your veterinarian immediately — early reporting is both a legal obligation and a critical step in preventing herd-wide spread.

Which Animals Require a Coggins Test in Oregon

EIA is a viral disease that affects any equine species — horses, donkeys, mules, and zebras. Oregon’s testing requirements apply to all of these animals, not just domestic horses. If you own or transport any member of the equid family within or into Oregon under the conditions described below, the Coggins requirement applies to you.

Oregon law requires that all horses and other equids imported into Oregon have a negative official test for Equine Infectious Anemia (EIA) within twelve (12) months prior to entry into Oregon. This rule applies regardless of the purpose of the trip — whether you are hauling a horse to a trail ride, a show, or a new permanent home.

There are two narrow exemptions to the import testing requirement. This requirement does not apply to equidae imported for the sole purpose of treatment by a licensed veterinarian, immediately after which they are returned directly to the place of origin, or to suckling foals under six (6) months of age traveling with their dams.

Outside of those two exceptions, every equid crossing into Oregon needs a current negative Coggins test on record. This includes animals coming from neighboring states like Washington, Idaho, and California. You should also be aware that many Oregon equine events, competitions, and fairgrounds require proof of a negative test for any horse on the premises — even horses that are already Oregon residents. Check with individual event organizers before you arrive, as venue-level requirements may be stricter than state minimums.

Important Note: The suckling foal exemption applies only when the foal is traveling with its dam and the dam has a current negative Coggins test. A foal traveling without its dam does not qualify for this exemption.

When a Coggins Test Is Required in Oregon

Oregon triggers a Coggins test requirement in several distinct situations. Understanding each one helps you stay ahead of paperwork deadlines rather than scrambling at a checkpoint or sale barn.

• Interstate import: Oregon law requires that all horses and other equids imported into Oregon have a negative official test for EIA within twelve (12) months prior to entry into Oregon.
• Interstate movement from Oregon to neighboring states: Effective February 13, 2017, a horse traveling between Oregon, Washington, and Idaho must have a current Certificate of Veterinary Inspection, a negative Coggins test within the prior six months, and an entry permit.
• Equine exhibitions and events: Many Oregon exhibitions require a current negative EIA test for all equids on the premises, consistent with OAR 603-011-1220. Confirm requirements directly with the event organizer well in advance.
• Sale or change of ownership: The Coggins test is required when a horse is sold. Some state statutes or regulations require a horse to have a recent Coggins test — a seller’s failure to provide this means he or she might have violated a state law and be subject to certain penalties.
• International travel: Canada requires that your horse have a negative Coggins test within 6 months and a Canadian International Certificate within 30 days of travel.

If you travel between the states of Washington, Oregon, Idaho, Nevada, California, and Montana, your horse can be issued a Six Month Passport. It combines both a Coggins and CVI into one form and is typically good for 6 months from the date of the Coggins test. This is a practical option if you haul frequently across the region. For more on Oregon’s livestock transport documentation requirements, see our guide on livestock trailer requirements in Oregon.

How the Coggins Test Works and Approved Testing Methods in Oregon

The Coggins test was developed in 1970 and remains the international benchmark for EIA diagnosis. The Coggins test uses blood to test for antibodies to EIA. If antibodies are detected, the horse is considered infected with EIA and has a positive Coggins.

The AGID (agar gel immunodiffusion), or Coggins, test has been shown to correlate with horse inoculation test results for EIAv and can be used to identify EIAv carriers. Although other serologic tests have been defined and approved for the diagnosis of EIA, the AGID test is recognized internationally as the “gold standard” serologic test.

Although the internationally accepted serological test is the agar gel immunodiffusion (Coggins) test, a variety of ELISAs are increasingly accepted because they can provide rapid results. ELISAs are often used for screening; however, because they can give a higher rate of false positives, all positive ELISA results must be confirmed by the Coggins test.

The blood sample is sent by a federally accredited veterinarian to a federally approved laboratory. Only Category II accredited veterinarians, who are authorized to perform accredited duties in the state in which samples are collected, may submit samples to an APHIS-approved laboratory. You cannot simply draw the blood yourself and send it off — the accreditation chain is mandatory.

The test requires a simple blood draw, some paperwork, and results are typically back within 2 days. There is an expedited version of the test available which yields results within 12 to 24 hours. Electronic Coggins tests are available through GlobalVetLink, which allows you to access and print your horse’s results at any time. Plan to schedule your appointment with your veterinarian at least one to two weeks before any planned travel to allow time for lab processing.

Pro Tip: Ask your veterinarian about the Six Month Extended Equine Certificate of Veterinary Inspection (EECVI). An EECVI is valid for six months from the CVI inspection date or until the horse’s current EIA/Coggins test expires, whichever comes first. Since EIA tests are typically valid for 12 months from the blood draw date, the EECVI expiration is determined by whichever date occurs sooner. Oregon participates in this program, making it a cost-effective option for frequent travelers.

Interstate Movement and Import Requirements in Oregon

Oregon’s import requirements sit within a broader federal framework managed by USDA APHIS, but the state adds its own conditions on top of federal minimums. When you bring a horse into Oregon from any other state, you need to satisfy both layers.

The core documents required for most interstate movements into Oregon are:

1. Negative EIA/Coggins test: Must be dated within 12 months of entry for most states, or within 6 months for movement from Washington, Idaho, and other Pacific Northwest states under the revised 2017 requirements.
2. Certificate of Veterinary Inspection (CVI): Commonly referred to as a “health certificate,” this paperwork certifies that your horse appears to be free of infectious, contagious, and communicable diseases and that they can safely travel to other states. It requires a brief physical exam by a veterinarian.
3. Entry permit: Some states, such as Oregon and Montana, require prior permit numbers to track entry of animals into their states. Contact the Oregon Department of Agriculture before your trip to confirm current permit requirements.

The Pacific Northwest context matters here. A Coggins test was not required if you were transporting your horse between Oregon, Washington, and Idaho because these states had reciprocal agreements that exempted horses from the Coggins test requirement. However, the states revoked the reciprocal agreements after several cases of equine infectious anemia were reported in these states in 2016. That exemption no longer exists.

The person or entity responsible for moving a horse interstate must ensure they have an ICVI or other USDA-required document. New regulations also give state animal health officials the discretion to approve other methods of movement documentation, which might include a negative Coggins test, an event passport, an owner-shipper statement, or a brand certificate.

For horses moving out of Oregon, you are also responsible for meeting the destination state’s requirements. Oregon’s own brand inspection requirements may apply when moving horses out of state, particularly for sale or permanent relocation.

What Happens When a Horse Tests Positive in Oregon

A positive EIA test result sets off a mandatory sequence of regulatory actions. The process moves quickly, and you have very little discretion about the immediate steps.

When an equine has a positive result on an official test for EIA, the animal must be placed under quarantine within 24 hours after positive test results are known, in order to permit confirmation testing and to prevent further exposure of other equines. The equine must remain in quarantine until final classification and disposition are made.

All diagnostic laboratories are required to report positive test results to federal and state authorities for appropriate action. This means you will not be the first to know — state and federal veterinarians are notified simultaneously with you. The Oregon Department of Agriculture’s State Veterinarian will be involved from the moment a positive is confirmed.

Confirmation testing follows the initial positive. The two most commonly used serologic tests are the agar gel immunodiffusion (AGID), commonly known as the Coggins test, and the ELISA test. The ELISA test can detect antibodies earlier than the AGID test. As the ELISA test may produce false positive results, the confirmatory test for EIA is the AGID.

Once confirmed, the horse is classified as a reactor. Seropositive horses are then identified by a National Uniform Tag code number that the USDA state veterinarian provides. The movement of positive horses is then closely regulated by federal agencies.

Quarantine, Euthanasia, and Isolation Rules in Oregon

The options available to you after a confirmed positive are limited and strictly defined. Oregon follows the national framework established by USDA APHIS, which gives owners two paths: euthanasia or lifetime quarantine.

All exposed equines — either individual or within a herd — within 200 yards of the location where a reactor equine is or was maintained must also be placed under quarantine. The quarantine area must provide no less than 200 yards of separation from all other equines.

The quarantine area and the quarantined equines therein must be monitored periodically by regulatory personnel to ensure that provisions of the quarantine are not being violated. This is not a self-monitored arrangement — state veterinarians and APHIS personnel conduct periodic checks.

For the confirmed positive animal itself, the two disposition options are:

• Euthanasia: If a horse tests positive for equine infectious anemia, euthanasia is often recommended as the most prudent option, albeit a difficult one. This is the option most commonly elected by owners and the one most strongly encouraged by regulatory authorities.
• Lifetime quarantine: The alternative to euthanasia is permanent isolation and quarantine of the infected animal at least 200 yards from all other equids on a site, along with insect control measures. Transportation and housing are severely restricted. Owners who choose quarantine must post signs clearly stating the housing of a quarantined animal.

Infected horses will always pose a health risk to other horses, whether or not they show signs of illness. Even in the best management situations, blood-feeding insects cannot be totally controlled or eliminated. This is why regulatory guidance consistently leans toward euthanasia as the more protective choice for the broader equine population.

Exposed horses that are not confirmed positive must still be retested. They will need to be tested again 30–60 days after the initial positive test. Once everyone has tested negative for at least 60 days, they can be considered out of quarantine.

Important Note: There is no approved vaccine for EIA in the United States, and there is no treatment. Prevention through annual testing, fly control, and sterile equipment practices is the only reliable protection available to horse owners.

Penalties for Non-Compliance in Oregon

Failing to comply with Oregon’s EIA testing requirements carries real consequences. The state enforces its animal health rules through the Oregon Department of Agriculture, with authority derived from Oregon Revised Statutes and the Oregon Administrative Rules governing livestock disease control.

If you choose to travel with your horse or other animal without the necessary requirements, you may face a variety of consequences. You may be stopped at a checkpoint entering a state or at any time in the state by law enforcement. If your animal is found not to have the proper paperwork and permits, you may face a fine and/or your animal may be confiscated and quarantined for weeks, and additional disease testing may be performed at your cost.

While some state statutes or regulations require a horse to have a recent Coggins test, a seller’s failure to provide these items only means he or she might have violated a state law and be subject to certain penalties. It does not void the sale. This is an important point for buyers: always verify a current negative Coggins test before completing any purchase, because legal recourse after the fact is limited.

Beyond fines and confiscation, the Oregon Department of Agriculture has authority under ORS Chapter 596 to order quarantine, require testing at the owner’s expense, and compel disposition of reactor animals. Violations of quarantine orders carry additional penalties. Owners who knowingly move a reactor animal in violation of a quarantine order face the most serious enforcement actions, which can include criminal referral under Oregon’s animal disease statutes.

The practical lesson is straightforward: the cost of a Coggins test — typically a routine veterinary expense — is far less than the cost of a fine, a forced quarantine, or the loss of an animal. Staying current on testing also protects the horses around you, which is the core purpose of the entire regulatory framework. For a broader look at how Oregon regulates animal identification and health documentation, see our overview of brand inspection requirements in Oregon and the state’s approach to animal DNA testing laws.

Requirement	Who It Applies To	Test Validity Window	Key Document
Import into Oregon (most states)	All equids	Within 12 months of entry	Negative EIA test + CVI + entry permit
Movement between OR, WA, and ID	All equids	Within 6 months	Negative EIA test + CVI + entry permit
Equine exhibitions and shows	All equids on premises	Varies by event; confirm with organizer	Negative EIA test
Sale or change of ownership	All equids being sold	Within 12 months	Negative EIA test
Travel to Canada	All equids	Within 6 months	Negative EIA test + Canadian International Certificate
Suckling foals (under 6 months) with dam	Foals traveling with tested dam	Exempt from EIA test requirement	Dam’s current negative EIA test

If you have questions about your specific situation, contact the Oregon Department of Agriculture Animal Health program or your USDA APHIS Area Veterinarian in Charge. Regulations can be updated, and your veterinarian — who must be federally accredited to draw and submit samples — is your best on-the-ground resource for staying current. You can also consult the USDA APHIS EIA program page for federal-level guidance and annual case summaries.