Coggins Test Requirements in New Mexico: What Every Horse Owner Needs to Know
July 25, 2026
If you own, transport, or compete with horses in New Mexico, the Coggins test is one legal requirement you cannot afford to overlook. Equine Infectious Anemia (EIA) is a viral disease caused by a lentivirus, a member of the family known as retroviruses — and retroviruses incorporate their genetic material into the DNA of host cells, generally infecting the host for life. Because there is no cure and no vaccine, routine testing is the only tool regulators and horse owners have to keep the disease from spreading through a herd.
New Mexico enforces EIA testing through the New Mexico Livestock Board (NMLB), which administers both intrastate and interstate movement rules. Whether you are hauling a horse to a local show, crossing a state line, or buying a new animal, understanding exactly what the NMLB requires — and what happens when a horse tests positive — will help you stay compliant and protect your animals.
What Is Equine Infectious Anemia (EIA) and Why It Is Regulated in New Mexico
Equine Infectious Anemia is caused by equine infectious anemia virus (EIAV), a lentivirus in the family Retroviridae. The disease has been known by several informal names over the decades — swamp fever, mountain fever, and slow fever among them — but all refer to the same incurable, lifelong infection.
The virus is transmitted to horses mechanically on the mouthparts of biting flies such as horse flies and deer flies, making transmission more common in the spring, summer, and early fall. It also spreads through contaminated equipment such as needles and surgical tools. The virus persists in the blood leukocytes of the horse for life, and EIA virus may also be passed from a mare to her foal in utero; possible transmission through milk has been reported in some nursing foals.
While certain equines may carry the virus without displaying any outward signs, others may exhibit pronounced symptoms such as irregular heartbeats, edema in the legs and abdomen, lethargy, anemia, elevated body temperature, and, in severe cases, sudden death. Inapparent carriers show no visible signs but remain contagious, and once infected, a horse is a lifetime carrier posing a threat to other equines.
There is no vaccine available for the disease, nor is there any curative treatment. That reality is precisely why New Mexico law mandates testing as a condition of entry, movement, and participation in equine events. EIA is a reportable disease regulated by the USDA and state animal health regulatory agencies.
Key Insight: EIA poses no documented risk to human health. According to the American Association of Equine Practitioners (AAEP), there is no evidence that equine infectious anemia is a zoonotic risk — meaning it cannot be transmitted from horses to people.
Which Animals Require a Coggins Test in New Mexico
All equidae — which includes horses, mules, and asses — entering New Mexico must be accompanied by an official health certificate attesting the equidae in the shipment are free from symptoms of infectious or contagious disease. The EIA testing requirement applies broadly to this entire group of animals, not just horses.
Any horse six months of age or older being brought into New Mexico is required to have a negative AGID or ELISA test for EIA within 12 months of entry, except for nursing foals accompanying EIA test-negative dams. This age threshold reflects the fact that very young nursing foals traveling with a tested, negative dam represent a lower transmission risk.
The same logic extends to animals heading to slaughter. Foals that are nursing and accompanied in shipment by a negative EIA-tested dam, and equidae consigned directly to slaughter in New Mexico, are not required to be tested for EIA. Outside those two narrow exemptions, all equidae fall under the testing requirement.
For horses already residing in New Mexico, EIA tests are required when participating in shows, sales, breeding programs, and for general disease surveillance to prevent the spread of this lifelong infection. If you are buying or selling a horse within the state, carrying a current negative test certificate is standard practice and widely required by event organizers and sales facilities. You can learn more about the fastest horse breeds and the equine activities that may trigger testing requirements.
When a Coggins Test Is Required in New Mexico
New Mexico’s testing rules apply in several distinct situations. The most common triggers are summarized below.
| Situation | Test Required? | Validity Period |
|---|---|---|
| Entering New Mexico from another state | Yes | Within 12 months of entry |
| Exiting New Mexico to another state | Yes (destination rules apply) | Varies by destination state |
| Participating in shows, exhibitions, or competitions | Yes (venue may require more frequent testing) | Within 12 months |
| Change of ownership / sale | Yes | Within 12 months |
| Nursing foal with negative-tested dam | No | N/A |
| Equidae consigned directly to slaughter | No | N/A |
Normally, test results are valid for use in transporting horses for 12 months following the test; however, some states or specific venues may require more frequent testing. Following the EIA positives found among racing Quarter Horses in late 2024, New Mexico and neighboring states announced updated requirements — for instance, some racing venues began requiring a negative Coggins test dated within 60 days of arrival for horses arriving from out of state.
Although a Certificate of Veterinary Inspection (CVI), commonly referred to as “health papers,” is not routinely required for transporting horses within New Mexico, a CVI is required when transporting horses across the New Mexico state line into surrounding states. A CVI is available from any licensed New Mexico veterinarian and is normally valid for 30 days following the official inspection of the horse(s) it covers.
Pro Tip: New Mexico participates in the Extended Equine Certificate of Veterinary Inspection (EECVI) program. An EECVI is valid for six months from the CVI inspection date or until the horse’s current EIA test expires — whichever comes first — giving frequent travelers a more practical option than a standard 30-day CVI.
How the Coggins Test Works and Approved Testing Methods in New Mexico
A horse Coggins test is a blood test that determines whether a horse is carrying EIA, a viral and deadly disease among equines. The test detects antibodies against the virus rather than the virus itself, so a positive result confirms the horse’s immune system has responded to EIAV.
According to the New Mexico Administrative Code (21.30.4 NMAC), the agar gel immunodiffusion (AGID) test, also known as the Coggins test, the competitive enzyme-linked immunosorbent assay (CELISA) test, and other USDA-licensed tests approved by the NMLB are the official tests for equine infectious anemia in all equine species.
The two methods differ in speed and sensitivity:
- AGID (Coggins test): The most widely accepted procedure for the diagnosis of EIA. It detects antibody against the viral p26 antigen (the major core protein) and is the only procedure that has been statistically correlated with the presence of EIA virus in blood. Results typically take 24–48 hours.
- ELISA / CELISA: The ELISA test can detect antibodies earlier than the Coggins test; however, as the ELISA test may produce false positive results, the confirmatory test for EIA is the AGID test.
Only USDA-approved laboratories are allowed to run the AGID and CELISA or other USDA-licensed tests. Equine blood samples collected for official EIA tests must be collected by a state or federal animal health official or an accredited veterinarian who is licensed in the state in which the animal is located.
For a Coggins test to be completed, a licensed veterinarian needs to draw the blood and take photographs of the horse’s left and right side, as well as the face. The veterinarian also needs to document all markings on the horse. The completed certificate — officially USDA VS Form 10-11 — must include the horse’s name, owner information, stable address, and the animal’s age, breed, and sex.
Starting April 15, 2020, all veterinarians and laboratories must use USDA-approved EIA test forms. GlobalVetLink’s digital EIA certificates include the statement “Official EIA Test Form, Approved by USDA Veterinary Services March 2020, GVL” and meet all current federal requirements. Digital certificates are accepted in New Mexico, making it easier to store and share results. The GlobalVetLink platform is one tool veterinarians use to submit tests electronically to labs and deliver results directly to horse owners.
Interstate Movement and Import Requirements in New Mexico
Moving a horse across the New Mexico state line — in either direction — triggers specific documentation requirements that go beyond what is needed for intrastate travel.
All equidae entering the state of New Mexico must be tested and negative, within 12 months prior to entry, for equine infectious anemia using the AGID test, the CELISA test, or other USDA-licensed test approved by the board. The date of the test, the laboratory, and the results must be shown on the required health certificate. Individual identification and/or description of the animal(s) must also be provided on the health certificate.
The New Mexico statute specifically requires the board to prohibit the driving or transporting into this state of any horses or other equidae that have not tested negative to the AGID or Coggins test or a USDA-approved equivalent test within twelve months prior to the date of entry, with evidence of that test result shown on a health certificate.
When leaving New Mexico, the rules of the destination state govern what documentation you need. In addition to the CVI, a copy of the form used to verify a negative laboratory test for equine infectious anemia is required for transport across the New Mexico state line. Always check destination-state requirements before hauling, as some states or venues impose shorter validity windows — particularly for racing or high-density equine events.
New Mexico participates in the EECVI program, which is accepted in over 37 states including neighboring Arizona, Colorado, Oklahoma, and Texas. An EECVI paired with a Health Declaration and Movement Permit (HDMP) can simplify multi-trip travel significantly. The HDMP is the travel document that horse owners create for each individual trip when using an EECVI; owners enter their travel dates, origin, and destination, and the system generates an HDMP that serves as the documentation displayed when crossing state borders.
Important Note: Brand inspection requirements also apply when moving horses between New Mexico inspection districts. According to New Mexico State University Extension, horses transported from one inspection district to another require a current brand inspection form dated within the previous 7 days, or a permanent hauling permit. Contact the NMLB or your local brand inspector for details.
For related New Mexico animal regulations, see our guide to fishing license requirements in New Mexico.
What Happens When a Horse Tests Positive in New Mexico
A positive EIA result sets a specific regulatory process in motion under New Mexico Administrative Code 21.30.4 NMAC. The steps are time-bound and non-negotiable.
- Hold order placed immediately. Any equid testing positive for EIA on surveillance sampling will be placed on a hold order at its current location, isolated from other equids by at least 200 yards, until confirmatory testing is completed at the USDA National Veterinary Services Laboratory (NVSL).
- NVSL confirmation. The initial positive result from a field laboratory must be confirmed by the NVSL before final regulatory action is taken. If the NVSL determines the sample is negative based on AGID, the hold order will be released.
- Hold upgraded to quarantine. If NVSL confirms the sample is positive based on AGID, the hold order will be upgraded to a quarantine within 24 hours of receipt of confirmation. Regulatory testing of the EIA-positive equid and its cohorts will be performed by a state or federal regulatory veterinarian within five days of NVSL confirmation.
- Branding (if not immediately euthanized). Any EIA-positive equid that cannot be euthanized within five days of NVSL confirmation, or any EIA-positive equid destined for export, shall be branded — either freeze or hot-iron — with an 85A on the left neck or left shoulder in accordance with the USDA EIA uniform methods and rules within five days of NVSL confirmation.
- Euthanasia or export. Euthanasia or export shall occur within 30 days of NVSL confirmation. The owner is responsible for the cost of export or euthanasia and disposal of the EIA-positive equid(s) and shall not be indemnified by the state for any loss caused by the destruction or loss of value of the equid(s).
This process reflects the gravity of an EIA diagnosis. As reported by The Horse following a New Mexico EIA outbreak, EIA has no vaccine and no cure, and a horse diagnosed with the disease dies, is euthanized, or must be placed under extremely strict quarantine conditions — at least 200 yards away from unaffected equids — for the rest of its life.
Quarantine, Euthanasia, and Isolation Rules in New Mexico
New Mexico’s quarantine and isolation rules for EIA-positive horses align with the USDA’s Uniform Methods and Rules (UM&R) but include state-specific procedural requirements administered by the NMLB.
Movement of a quarantined horse: If an EIA-positive equid is located on a premises other than that of the owner at the time of quarantine, the Office of the State Veterinarian may authorize movement of the EIA-positive equid to the owner’s premises or a premises approved for isolation by the NMLB. The movement must occur under the direct supervision of the NMLB, and the trailer shall be sealed by a livestock inspector prior to leaving the origin. Seals shall be broken only by a livestock inspector at the destination.
Euthanasia documentation: The veterinarian performing the euthanasia must provide a written affidavit to the Office of the State Veterinarian within 72 hours of performing the euthanasia. This paper trail ensures the NMLB can close the case and confirm the positive animal has been removed from the equine population.
Exposed and high-risk equids: Exposed or high-risk equids are those determined to have an epidemiological link to the positive animal, either by proximity, common ownership, or other factors. Exposed or high-risk equids may be tested by an accredited veterinarian at the owner’s expense, or by a state or federal regulatory veterinarian. Equids tested by an accredited veterinarian may be subject to a retest by a state or federal regulatory veterinarian at any time.
The 200-yard isolation distance is a federal standard that New Mexico enforces. Per USDA EIA program rules, a confirmed EIA-positive equid must be euthanized or quarantined for life 200 yards away from any EIA-negative equid. In practice, maintaining that separation on most residential or small farm properties is extremely difficult, which is why euthanasia is the most common outcome after a confirmed positive.
You may also be interested in learning about other animals regulated in New Mexico, including types of snakes in New Mexico and types of owls in New Mexico.
Penalties for Non-Compliance in New Mexico
Failing to comply with New Mexico’s EIA testing and movement rules carries real legal consequences. The NMLB enforces livestock regulations under Chapters 30 and 77 of the New Mexico Statutes Annotated (NMSA 1978), and violations can result in civil and criminal penalties.
Any violations of Chapters 30 or 77, NMSA 1978, or NMLB rule violations, may be reason for regulatory action. Practically, this means that transporting a horse into New Mexico without a valid negative EIA test certificate can result in the animal being turned away at a livestock checkpoint, impounded, or quarantined at the owner’s expense until testing is completed.
The NMLB operates livestock checkpoints on major routes into the state. All livestock in transition, upon approaching a livestock checkpoint, will be stopped for transportation validation. All livestock in transition near the geographical location of a restricted zone will be stopped for transportation validation at the discretion of the livestock inspector. All road stops will be initiated by a livestock inspector certified as a law enforcement peace officer or by any certified peace officer of the state.
Beyond checkpoint stops, knowingly transporting an EIA-positive horse or falsifying health certificates constitutes a criminal offense under New Mexico livestock law. The owner of an EIA-positive horse also bears direct financial liability: the owner is responsible for the cost of export or euthanasia and disposal of the EIA-positive equid(s) and shall not be indemnified by the state for any loss caused by the destruction or loss of value of the equid(s).
Event organizers also carry responsibility. Event officials must review official test papers of all equines entered into an event to ensure that all participating equines are test-negative. Allowing untested horses to participate in a sanctioned event can expose organizers to liability and regulatory scrutiny.
Pro Tip: Keep your horse’s Coggins certificate, CVI, and brand inspection paperwork in a dedicated folder in your trailer at all times. New Mexico livestock inspectors can stop any transport vehicle for documentation review, and having organized records on hand prevents delays and potential fines.
Staying current with EIA testing is one of the simplest and most effective steps you can take as a horse owner. The test is inexpensive relative to the cost of non-compliance, and a valid negative certificate opens doors to travel, competition, and sales across New Mexico and beyond. For more on New Mexico’s wildlife and animal regulations, explore our articles on types of hawks in New Mexico, types of bats in New Mexico, and types of rattlesnakes in New Mexico. For the latest official requirements, always contact the New Mexico Livestock Board directly or consult an accredited veterinarian licensed in New Mexico.