Coggins Test Requirements in Louisiana: What Every Horse Owner Must Know

If you own, sell, or travel with horses in Louisiana, the Coggins test is not optional — it is a legal requirement enforced by the Louisiana Department of Agriculture and Forestry (LDAF). Equine Infectious Anemia (EIA), commonly known as “swamp fever” due to its prevalence in Gulf Coast states, is an infectious viral disease that affects members of the Equidae family — horses, mules, donkeys, and zebras. Louisiana sits squarely in the high-risk zone for this disease, which makes understanding the state’s testing rules essential for every equine owner.

This guide breaks down exactly what Louisiana law requires, which animals must be tested, when testing is triggered, how the test works, and what happens if a horse comes back positive. Whether you are a first-time horse owner or a seasoned equestrian, staying current on these rules protects your herd and keeps you on the right side of state regulations.

Pro Tip: Keep your horse’s original negative Coggins certificate accessible at all times — at home, at shows, and during transport. State inspectors and event organizers can request it without notice.

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

EIA is an infectious viral disease that affects only members of the Equidae family and can present in three degrees of infectiousness: acute, chronic, or inapparent. The acute form is the most damaging and difficult to diagnose, often associated with first exposure to the virus and causing fever and small areas of hemorrhaging on the mucous membranes within seven to 30 days after exposure.

If the horse survives the acute stage, it may progress to chronic symptoms: fever, hemorrhages on the mucous membranes, depression, weight loss, swelling of the legs and abdomen, and anemia. Most horses, however, are inapparent carriers — they appear completely normal and display no clinical abnormalities, yet remain lifelong carriers of the virus.

The most significant transmitters of EIA are horseflies and deerflies, though other blood-sucking insects like mosquitoes and gnats can spread the virus as well. Research done at Louisiana State University has shown that a single horsefly can transmit the infection from a horse in the acute stage of EIA to another horse. This biological reality — combined with Louisiana’s warm, humid climate — is exactly why the state maintains strict testing mandates.

Efforts to control EIA in the United States started in 1972, and since then the estimated national prevalence has dropped from nearly 4 percent of the equine population to 0.004 percent. Louisiana has significantly reduced its numbers of EIA-positive horses since implementing its testing program in the early 1990s. There is currently no effective treatment, cure, or vaccine for EIA, which makes prevention through testing the only viable control strategy.

If you are interested in other Louisiana animal regulations, see the livestock trailer requirements in Louisiana for rules on transporting animals safely and legally.

Which Animals Require a Coggins Test in Louisiana

Horses residing in Louisiana require an annual test for Equine Infectious Anemia (EIA, or Coggins Test) and permanent identification. The requirement is not limited to horses alone. Because EIA affects all members of the Equidae family, mules and donkeys fall under the same regulatory framework.

Foals are required to be tested no later than one year after the foal is born. This deadline is firm — waiting until a foal is older than 12 months before testing puts the owner out of compliance with state law. It is worth noting that testing very young foals can produce misleading results: false positives can occur when foals with circulating colostral antibodies from suckling EIA-infected mares are tested, though these colostral antibodies are no longer present at approximately six to nine months of age.

Foals of any age must also be tested for EIA if traveling to a show. This applies regardless of whether a foal has reached the standard annual testing deadline. The table below summarizes which animals must be tested and the applicable deadlines.

Animal Type	Testing Requirement	Frequency
Horses (resident)	Annual Coggins test + permanent ID	Every 12 months
Mules and donkeys	Annual Coggins test	Every 12 months
Foals	Must be tested no later than 1 year after birth	Annual thereafter
Horses being sold	Negative test within 6 months of ownership transfer	Per transaction
Horses imported into Louisiana	Negative test within the past 12 months	Per entry

When a Coggins Test Is Required in Louisiana

Louisiana triggers a Coggins test requirement across several distinct situations. Understanding each trigger helps you plan ahead and avoid compliance gaps.

• Annual residency requirement: All horses in Louisiana are required to have a Coggins test performed annually.
• Change of ownership: If there has been a change in ownership of the horse, the Coggins test must be current within six months of the transaction.
• Importing equines into Louisiana: All equines imported into Louisiana for any purpose other than consignment to an approved Louisiana livestock auction market or an approved slaughter establishment for immediate slaughter must be accompanied by a record of a negative official test for EIA conducted within the past 12 months.
• Shows and exhibitions: Each horse must be accompanied by an original negative official test for EIA, and the horse must have tested negative within the past 12 months.
• Interstate travel: A negative Coggins is required any time you move a horse across state lines (covered in detail in the interstate section below).

Key Insight: The six-month rule for sales is stricter than the 12-month annual residency rule. If you are buying or selling a horse, confirm the test date — a certificate that is seven months old may be valid for residency purposes but will not satisfy the sale requirement.

How the Coggins Test Works and Approved Testing Methods in Louisiana

Diagnosis of EIA was not possible until the 1970s, when Dr. Leroy Coggins developed a serologic agar-gel immunodiffusion test, now commonly known as the Coggins test. The test detects antibodies to the EIA virus in a blood sample drawn from the horse. A positive result means the horse has been exposed and carries the virus; a negative result means no antibodies were detected at the time of the blood draw.

Two primary testing methods are approved for regulatory use in the United States. The two most commonly used serologic tests are the agar gel immunodiffusion (AGID) — the original “Coggins” test — and the enzyme-linked immunosorbent assay (ELISA). Although the internationally accepted test is the AGID (Coggins) test, ELISAs are increasingly accepted because they provide rapid results; however, because ELISAs can give a higher rate of false positives, all positive ELISA results must be confirmed by the Coggins test.

More recently, ELISA tests have reduced the time for a lab result from 24 hours to less than one hour. This speed advantage makes ELISA useful for screening at high-volume events, but the AGID confirmation step remains the legal standard for a definitive positive diagnosis.

The test must be administered and submitted by a licensed, USDA-accredited veterinarian. 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. The official test must be conducted by an approved laboratory, and the name of the laboratory, the case number, and the date of the official test must appear on the health certificate.

Starting April 15, 2020, all veterinarians and laboratories must use USDA-approved EIA test forms. Digital certificates issued through platforms like GlobalVetLink meet these federal requirements and are accepted for regulatory compliance.

Important Note: The original test result paper — not a photocopy — is typically required at shows and during transport. Confirm with your event organizer whether a digital certificate is accepted in lieu of a paper original.

Interstate Movement and Import Requirements in Louisiana

Moving horses across state lines adds another layer of documentation requirements on top of Louisiana’s baseline annual testing rule. All states require a negative Coggins test before a horse can be transported across state lines. Louisiana’s specific import rules, however, go further than the federal minimum.

According to the Louisiana Department of Agriculture and Forestry, all equines imported into Louisiana for any purpose — other than consignment to an approved livestock auction market or slaughter establishment — must be accompanied by a negative EIA test conducted within the past 12 months. Beyond the Coggins test, you also need a health certificate. To enter Louisiana, you must have a health certificate that includes each animal’s temperature and was issued within 30 days of travel, as well as a negative EIA test issued within one year of travel.

Livestock brought into Louisiana must be accompanied by an official Certificate of Veterinary Inspection (CVI) stating the animals are free from signs of infectious or contagious diseases, free from signs of internal and external parasites, and meet specific requirements stated in regulation. Health certificates are valid for 30 days from the date of issue.

Louisiana also 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/Coggins test expires, whichever comes first, since EIA tests are typically valid for 12 months from the blood draw date. This program is useful for horse owners who travel frequently between states throughout a show season.

When leaving Louisiana for another state, requirements are set by the destination state. You must send completed health certificates to the LDAF office within 7 days of issue, and the department will forward a copy to the state of destination. Any further individual entry requirements are determined by the state of destination. You can also review the hunting license requirements in Louisiana for more context on how the state regulates animal-related activities.

What Happens When a Horse Tests Positive in Louisiana

A positive EIA result triggers an immediate regulatory response. Animals testing positive for EIA in Louisiana must be euthanized or sold for slaughter only. Unlike some other states that allow permanent lifelong quarantine as a third option, Louisiana’s rules as reported by the LSU AgCenter are more restrictive for the positive animal itself.

It may take 60 days or more for a horse to test positive after infection. Infected animals that survive the disease become virus carriers and can infect other equids for life, and they must either be euthanized or permanently isolated from other equids to prevent transmission.

The positive test result must be reported to animal health authorities. Animal health professionals — including veterinarians, diagnostic laboratories, and public health personnel — report diagnosed or suspected cases of nationally listed reportable animal diseases to APHIS Area Veterinarians in Charge and to the State animal health official as applicable under state reporting regulations. EIA is a reportable disease in all 50 states.

Horses testing positive for equine infectious anemia are often required by law to be permanently identified via branding or tattooing and to be quarantined, and transportation and housing are severely restricted. Owners should contact the LDAF Animal Health office immediately upon receiving a positive result to understand the specific steps required under Louisiana’s regulations.

Quarantine, Euthanasia, and Isolation Rules in Louisiana

When a horse on a property tests positive, the consequences extend beyond that single animal. All animals located within 200 yards of an animal testing positive for EIA are subject to quarantine and require a minimum 30-day negative test before a quarantine release can be issued. This 200-yard radius rule is a cornerstone of EIA containment under both Louisiana regulations and USDA guidelines.

The scientific rationale behind the 200-yard distance is the flight range of the primary insect vectors. Blood-feeding insects transfer the virus from an infected animal to nearby uninfected animals while feeding, with the most efficient transfers involving horseflies, deer flies, and to a lesser extent stable flies — insects whose painful bite causes the horse to interrupt feeding, increasing the chance of mechanical virus transfer.

According to the Merck Veterinary Manual, because equids with confirmed disease are lifelong carriers of the virus, they are usually euthanized. 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.

Owners who choose quarantine must post signs clearly stating the housing of a quarantined animal. Any movement of the quarantined animal is restricted and requires authorization from state veterinary officials. Although the survival rate of horses infected with EIA is high, those animals become lifelong carriers and threaten the health of their offspring and other horses.

Important Note: The 30-day minimum quarantine for exposed horses is a Louisiana-specific rule. Some other states, such as California, require a 60-day retest period for exposed horses under USDA program guidelines. Always confirm current Louisiana requirements directly with the LDAF Animal Health division, as protocols may be updated.

Preventing EIA from reaching your property in the first place is far less costly than managing a positive case. Best practices include:

• Implementing a rigorous fly control program using foggers, fly sheets, and insect repellents
• Using a sterile, single-use needle and syringe for every injection — many epidemics of EIA have been linked to the reuse of hypodermic needles or non-sterile surgical equipment
• Requiring proof of a current negative Coggins test for any new horse entering your property
• Avoiding pasturing horses in swampy or standing-water areas where biting insects are densest

Penalties for Non-Compliance in Louisiana

Failing to comply with Louisiana’s EIA testing requirements carries real consequences. These are mandatory requirements, and if you are stopped by authorities without the required documents, large fines and interruption of your trip could result. This applies equally to horses being moved within the state and those crossing state lines.

The LDAF enforces equine health regulations under Louisiana’s agricultural statutes. Violations can result in administrative penalties, seizure of animals, and prohibition from participating in licensed livestock markets or shows. Horses found moving without a valid Coggins certificate may be turned back at the state border or detained at the point of inspection.

Beyond state-level enforcement, federal Animal Disease Traceability rules add another compliance layer. A federal requirement, effective March 11, 2013, governs the interstate movement of livestock covered under the Animal Disease Traceability rule: these livestock must be officially identified and accompanied by an interstate certificate of veterinary inspection when traveling interstate unless subject to specific exemptions.

The most effective way to avoid penalties is to work proactively with a licensed, USDA-accredited veterinarian. Schedule annual Coggins tests well before they expire, keep original certificates organized and accessible, and verify the specific requirements of any state or event you plan to attend. The LDAF equine regulations page and the USDA APHIS EIA program page are the authoritative sources for current requirements.

Staying in compliance is ultimately about more than avoiding fines — it protects your animals and the broader Louisiana horse community. You may also find it useful to review fishing license requirements in Louisiana and other state-level animal regulations to stay fully informed as an animal owner in the state. For those interested in equine performance, our guide to the fastest horse breeds offers a look at the athletic side of the animals you work so hard to protect.