Bovine Tuberculosis Testing Requirements in Vermont: What Livestock Owners Need to Know

Nearly two decades of coordinated testing turned Vermont from a state riddled with tuberculous dairy cattle into one the U.S. Department of Agriculture now treats as clean. That history still shapes the bovine tuberculosis testing requirements in Vermont that apply to your herd today, whether you’re shipping cattle across the Connecticut River into New Hampshire or selling raw milk straight off the farm. Vermont’s Agency of Agriculture, Food and Markets enforces these rules year-round, not just during outbreaks elsewhere.

This guide walks through who has to test, which methods are approved, what happens if an animal reacts, and what you risk if you skip the paperwork. If you also keep horses or work with wildlife on your property, you’ll notice some overlap with Vermont’s Coggins test requirements and rabies vaccination rules, since the state runs all of its animal disease programs through the same Animal Health Section.

What Is Bovine Tuberculosis and Why It Is Regulated in Vermont

Bovine tuberculosis is a chronic, contagious disease caused by Mycobacterium bovis, a slow-growing bacterium closely related to the germ that causes tuberculosis in people. Mycobacterium bovis is a slow-growing bacterium and the causative agent of tuberculosis in cattle, related to Mycobacterium tuberculosis, the bacterium which causes tuberculosis in humans. Two related bacteria, Mycobacterium avium and Mycobacterium tuberculosis, can also infect livestock and complicate diagnosis, which is part of why Vermont regulators track more than one Mycobacterium species when they investigate a reactor. Farmers dealing with poultry flocks should also be aware of avian tuberculosis, a related but distinct disease caused by M. avium.

The disease spreads through direct contact, inhaled droplets from infected lungs, and contaminated feed or milk, according to USDA’s Animal and Plant Health Inspection Service (APHIS). Bovine tuberculosis is a contagious, infectious, communicable disease of animals and humans caused by Mycobacterium bovis, and disease is spread by direct contact, inhalation of droplets expelled from infected lungs, and ingestion of contaminated feed or milk. Vermont’s regulatory interest isn’t new. Vermont state officials launched an innovative eradication campaign against bovine tuberculosis on farms from 1877 to 1936, at a time when infection rates in American dairy herds were far higher than they are now. That early campaign is why the state still runs one of the more disciplined testing programs in the Northeast for other bovine health issues, detailed on our bovine disease overview.

Pasteurization eventually broke the chain of transmission from cow to consumer, which is exactly why Vermont still singles out raw milk operations for mandatory testing today. Producers who sell raw milk directly to consumers are required to test their animals for tuberculosis since this milk is not pasteurized prior to consumption, and pasteurization has been proven to destroy the causative agent of tuberculosis.

Vermont’s TB Classification Status and Risk Zones

Under federal rules, USDA sorts states and zones into tiers, from accredited-free down to nonaccredited, based on how much tuberculosis regulators find in cattle, bison, and captive cervid herds. Under 9 CFR Part 77, there are currently no modified accredited zones designated anywhere in the country, which means no state, including Vermont, has a carved-out region held to different rules than the rest of the state. Vermont’s own agency describes its status plainly.

Vermont, like many other states, is considered to be tuberculosis free, though periodically infection is detected in herds in other states, and the movement of any infected animals into Vermont poses a risk to Vermont’s livestock herd and citizens. That risk calculus is why the classification matters beyond paperwork. If two or more affected herds are detected in an accredited-free state or zone within a 48-month period, the state or zone is removed from the accredited-free list and reclassified as modified accredited advanced, a downgrade that triggers stricter testing for every producer in the state, not just the farm where the infection turned up.

Key Insight: A single herd’s positive result rarely changes a state’s overall classification if it’s caught and depopulated quickly. Vermont’s status held even after isolated detections elsewhere in New England because the state’s rapid-response protocol keeps outbreaks contained to one premises.

Vermont’s wildlife adds a layer regulators watch closely, since deer and other cervids can carry M. bovis in some parts of the country. Hunters moving carcasses or live cervids should confirm current rules before transport; details on Vermont hunting license requirements cover related wildlife-handling obligations that intersect with disease surveillance.

Who Must Test and Which Animals Are Covered in Vermont

Two groups of producers face mandatory TB testing in Vermont regardless of where their animals came from. The first is any operation selling unpasteurized milk directly to consumers, since that product bypasses the heat treatment that kills the bacterium. The second is anyone moving susceptible livestock into or out of the state.

The Animal Health Section of the Vermont Agency of Agriculture, Food and Markets works with private accredited veterinarians to monitor for the presence of tuberculosis in Vermont’s livestock herd through targeted testing of susceptible animals prior to interstate movement. Susceptible species extend beyond dairy cows. Bovine tuberculosis is a rare disease that affects mammals, including cattle, deer, goats, dogs, and humans, which is why Vermont’s import rules cover cattle, bison, goats, and captive cervids rather than cattle alone.

In practice, you’ll need to plan for TB testing if you fall into any of these categories:

• You operate a raw milk dairy and sell directly to consumers
• You’re importing cattle, bison, goats, or captive cervids into Vermont from another state
• You’re moving animals from a herd where a reactor was recently identified
• You’re assembling a new herd on a premises where a tuberculous herd was previously depopulated

Horses are not part of the bovine TB program, though they carry their own disease-testing obligations. If you also board or trade equines, Vermont’s EIA and Coggins testing rules run on a parallel but separate track through the same Animal Health Office.

Approved TB Testing Methods in Vermont

Vermont’s accredited veterinarians rely on the same federally standardized tests used nationwide, starting with a skin test and escalating only if an animal reacts. The first test used is the Caudal Fold Test, and if the result is either a suspect or positive, it’s followed up with the short interval comparative tuberculin test, sometimes called the comparative cervical test.

The caudal fold test involves injecting tuberculin into the skin near the base of the tail and checking for a reaction three days later. Only bovine purified protein derivative tuberculin, licensed by USDA, may be used for official testing. Readings are recorded precisely. A negative result is entered as “N” when no change is observed at the injection site, while a “suspect” result is entered as “S” when the vet observes or palpates any increase in caudal fold thickness, size, or sensitivity.

Test	Purpose	Typical Timing
Caudal Fold Test (CFT)	Initial screening test for all cattle and bison	Read 72 hours after injection
Comparative Cervical Test (CCT/SICTT)	Follow-up for CFT suspects or positives	Within 10 days, or after a 60–90 day wait
Gamma Interferon Test	Blood-based follow-up alternative to CCT	Blood drawn within 30 days of CFT injection

If the follow-up test still points to infection, the case moves to federal or state regulatory veterinarians rather than staying with the private practitioner. If the CCT or gamma interferon test indicates that the animal is a reactor, all further herd testing is conducted by Federal or State regulatory veterinarians.

Pro Tip: Schedule TB testing with your accredited veterinarian well before your intended shipping date. A suspect result on the initial caudal fold test can add 10 days to 90 days to your timeline while the comparative cervical or gamma interferon follow-up is completed.

Interstate and Intrastate Movement Testing Requirements in Vermont

Moving livestock into Vermont from another state almost always requires paperwork beyond a clean bill of health. Import permits are required in advance of movement of all poultry and livestock species into Vermont except horses, and may be obtained by calling the Animal Health Office. The documentation requirements are specific about timing.

In most cases, livestock imported into Vermont must be officially identified, travel with a health certificate dated within 30 days of import, and must travel with an import permit number obtained from the Animal Health Office prior to transport. These requirements sit inside a broader regulatory framework. Importation of livestock and poultry into Vermont from another state is addressed in Rule #98074, the Rule Governing the Importation of Domestic Animals, Including Livestock and Poultry.

Movement within Vermont carries its own identification mandate, separate from interstate testing. Act 30 requires all livestock being transported within the state to satisfy the requirements for official identification for interstate movement under the USDA Animal Disease Traceability rule, 9 CFR part 86, prior to leaving the property of origin, regardless of the reason for movement or duration of absence from the property. That rule applies broadly. Livestock covered under Act 30 include dairy and beef cattle, sheep, goats, pigs, and camelids, and the identification requirement applies to movement from farm of origin to a slaughter facility, to a new farm location, or to a fair or exhibit.

Newly assembled herds face additional scrutiny if they’re built on ground where a tuberculous herd was previously removed. In these situations, tests must be conducted at 9 to 15 month intervals until the herd establishes a clean track record.

What Happens When a Suspect or Positive Result Occurs in Vermont

Any reaction on a screening test triggers immediate notification, not a wait-and-see approach. Accredited veterinarians must immediately report every suspected or diagnosed bovine TB case promptly to both the Assistant District Director and the State Animal Health Official. If the test produces any type of response, the veterinarian must immediately notify APHIS Veterinary Services and state animal health officials.

A suspect result doesn’t automatically mean infection. False positives happen because other bacteria can trigger a similar reaction. Follow-up testing exists specifically to sort true cases from false alarms. The caudal-fold test is used as a presumptive diagnostic procedure, and animals classified as suspect must be evaluated further by the comparative cervical test, the gamma interferon test, or sent directly to slaughter under permit.

If the comparative test also comes back positive, the animal doesn’t return to the herd. Following a positive SICTT result, the animal is slaughtered and tissues are collected for culture of the organism and histopathology. Culture confirmation is the final word. Only upon confirmation by culture is the animal considered TB positive. A confirmed reactor shifts the entire herd’s status and typically opens a broader epidemiologic investigation into contact animals, feed sources, and any recently added stock.

Quarantine and Herd Depopulation Rules in Vermont

When a herd is confirmed infected, Vermont has two regulatory paths available, both dictated by the federal Uniform Methods and Rules that the state follows as a cooperating partner in the national program. When health officials find tuberculosis in a herd, it is managed by either depopulating the herd or by testing and removing reactor animals.

Speed matters for the state’s classification. If an affected herd is detected in a state or zone classified as accredited-free, and the herd is depopulated and an epidemiologic investigation is completed within 90 days of detection with no evidence of spread, the state or zone may retain its accredited-free status. That 90-day window is the difference between an isolated incident and a statewide downgrade that would tighten testing rules for every Vermont producer.

Rebuilding a herd on a previously affected premises isn’t as simple as buying new stock. Individual animals added to the herd must be isolated from all other members of the herd of origin and must have negative results on two official tuberculosis tests conducted at least 90 days apart, with the second test conducted within 90 days prior to movement, and the additions kept in isolation until they test negative at least 90 days after arrival. That double-testing, extended-isolation protocol is designed to catch a slow-developing infection that a single test might miss.

Important Note: Tuberculosis has no approved treatment in livestock. Once an animal is confirmed positive through culture, removal from the herd is the only regulatory option; there is no course of antibiotics or quarantine-and-release path available under current federal rules.

Penalties for Non-Compliance in Vermont

Vermont’s Animal Health Section doesn’t treat import and identification rules as optional guidance. The Animal Health Section of the Vermont Agency of Agriculture, Food and Markets closely regulates the movement of livestock into and out of Vermont, and through this close oversight, staff help prevent the introduction and spread of domestic and foreign animal diseases that could be devastating to the state’s agricultural industry. Rule #98074 and Act 30 both give the agency legal authority under 6 V.S.A. Chapter 107 to enforce identification, permitting, and testing requirements on livestock moving into, out of, and within the state.

Practically, non-compliance tends to show up as denied entry, held shipments, or a required retest before an animal can move. Historical enforcement in Vermont was strict enough that, when cattle were quarantined and tested before entry, up to half were turned away for failing to meet requirements. Modern enforcement follows the same logic: animals lacking a valid import permit, current health certificate, or proper official identification can be held at the border, refused entry, or ordered into isolation until paperwork and testing catch up.

Important Note: Vermont’s published rules describe permitting, testing, and identification obligations in detail, but this article doesn’t list a specific fine schedule for violations. Contact the Vermont Agency of Agriculture’s Animal Health Office directly at (802) 828-2421 before moving animals to confirm current enforcement practices and any civil penalties that may apply to your situation.

VAAFM staff have also signaled an active compliance push rather than a passive one. VAAFM strongly encourages livestock farmers, dealers, transporters, and market personnel to review Act 30 and contact the Animal Health Office with questions, and staff work directly with impacted businesses and farms to ensure proper implementation of identification requirements. That outreach-first approach means producers who call ahead and ask questions typically avoid the friction that comes with an animal getting turned back at a sale barn or state line.

Vermont’s bovine TB program has run for well over a century, and the paperwork reflects lessons learned the hard way from decades of outbreaks and near-misses. Testing before you move animals, keeping identification current under Act 30, and calling the Animal Health Office when a question comes up will keep your herd, and Vermont’s tuberculosis-free status, exactly where both need to be.