Bovine Tuberculosis Testing Requirements in Connecticut: What Livestock Owners Must Know
August 9, 2026
If you own cattle, bison, goats, or farmed deer in Connecticut, bovine tuberculosis testing requirements are not just paperwork tucked away in a filing cabinet. They connect your farm to a decades-long federal-state eradication program, which means a lab decision made in Washington can dictate what your accredited veterinarian does on a Tuesday morning in Litchfield County.
This breakdown walks through how Connecticut classifies TB risk, which animals and owners fall under testing rules, which tests are legally recognized, and what happens the moment a suspect result shows up on a test chart. You will also see how movement, quarantine, and penalty provisions connect back to the same underlying statute.
What Is Bovine Tuberculosis and Why It Is Regulated in Connecticut
Bovine tuberculosis is caused by Mycobacterium bovis, a bacterium closely related to the pathogen behind human tuberculosis. It is a contagious, infectious, communicable disease of animals and humans that is commonly chronic and debilitating but occasionally becomes acute and rapidly progressive. The disease spreads through direct contact, inhalation of droplets from infected lungs, and ingestion of contaminated feed or milk.
Humans are not exempt from this risk. Transmission of bovine TB from infected cattle to humans occurs primarily through consumption of raw (unpasteurized) milk or raw milk products containing the bacteria. That zoonotic link is exactly why Connecticut, like every other state, treats bovine TB as a regulated livestock disease rather than a private herd-health matter left to individual producers.
At the expense of the state, the commissioner may require and provide for the testing and the control of tuberculosis in livestock in Connecticut. That authority is codified in Connecticut General Statutes Section 22-287, the core statute behind everything discussed in this article. Bovine TB should not be confused with avian tuberculosis, a related but distinct mycobacterial disease that affects poultry and wild birds under separate testing rules, or with the broader category of bovine disease conditions that Connecticut’s Department of Agriculture monitors across dairy and beef operations statewide.
Connecticut’s TB Classification Status and Risk Zones
The USDA sorts states and zones into tiers based on how much bovine TB circulates in their herds and wildlife. An accredited-free state or zone has the authority to enforce and complies with the Uniform Methods and Rules for Bovine Tuberculosis Eradication, has zero percent prevalence of affected captive cervid herds, and has had no findings of tuberculosis in captive cervid herds for the previous five years. A modified accredited status sits below that, generally reserved for states or zones with very low but not zero disease prevalence.
Under current federal regulation, Connecticut appears on the list of modified accredited states for captive cervid TB status, and the state currently has no modified accredited zones, meaning the classification applies uniformly rather than to a carved-out region within the state. To keep or improve that standing, a state must submit an annual report to APHIS certifying compliance with the Uniform Methods and Rules, filed each year between October 1 and November 30.
Wildlife plays a role in why some states struggle to reach accredited-free status. In areas of North America, white-tailed deer, American bison, and elk act as maintenance hosts for the disease. If you are curious about which species share pastureland and forest edges with Connecticut livestock, the rundown of wild animals that live in Connecticut is a useful companion read, and hunters tracking deer health as part of statewide surveillance should review current hunting license requirements in Connecticut before the season opens.
Pro Tip: Classification status can change from one federal rulemaking cycle to the next. Before you plan an interstate sale or exhibition, confirm Connecticut’s current tier directly with the State Veterinarian’s office rather than relying on last year’s paperwork.
| Classification Tier | General Requirement | Applies to Connecticut |
|---|---|---|
| Accredited-Free | Zero affected captive cervid herds; no TB findings in five years | Not currently applicable to cervids |
| Modified Accredited | Low prevalence; annual compliance report to APHIS | Yes, for captive cervids |
| Modified Accredited Zone | Sub-state region with distinct TB status | None designated |
Who Must Test and Which Animals Are Covered in Connecticut
For goats, cattle, bison, and captive cervids, testing procedures, methods, and the disposition of reactors must conform to the USDA Uniform Methods and Rules for Bovine Tuberculosis Eradication. For species of livestock other than those four, the State Veterinarian determines the applicable procedures. That gives Connecticut flexibility for less common livestock while locking the major species into the federal framework.
Testing itself is not open to just anyone with a syringe. Official testing for tuberculosis is restricted to the State Veterinarian, veterinarians employed by the federal government, and accredited veterinarians licensed to practice in Connecticut. Surveillance tests may be performed by a trained department employee under the supervision of the State Veterinarian, but no condemnation can be based on those surveillance results alone.
As the owner, you carry real obligations during testing day. You must provide assistance and proper restraint for confining the animals during testing and while the tests are applied. In practice, this typically means having a chute or head gate ready and enough help on hand so the accredited veterinarian is not delayed animal by animal.
- Cattle (dairy and beef)
- Bison
- Goats
- Captive cervids (farmed deer and elk)
- Other livestock species, as determined case-by-case by the State Veterinarian
This same owner-responsibility model shows up elsewhere in Connecticut animal law. Cat owners face comparable documentation duties under the rabies vaccine requirements for cats in Connecticut, where proof of a licensed veterinarian’s certification is non-negotiable for compliance.
Approved TB Testing Methods in Connecticut
The frontline screening test is the caudal fold test. A small amount of purified protein derivative tuberculin is injected into the fold of skin at the base of the tail, and the site is read 72 hours later, plus or minus six hours. If the animal has been exposed to bovine TB antigens, the injection produces a delayed hypersensitivity reaction with swelling and induration that usually begins within 8 to 12 hours and peaks around 72 hours after injection.
Reading the test requires hands-on evaluation, not a glance from across the pen. Test observation without palpation is unacceptable, and results are recorded on VS Form 6-22. A negative reading is entered when no change in tissue is observed at the injection site, while a suspect reading is entered when any increase in thickness, size, or sensitivity is observed or palpated.
A positive caudal fold response is only ever a starting point. 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. The comparative cervical test must be performed by a regulatory veterinarian and consists of two injections in the skin of the neck, one bovine tuberculin extract and one avian tuberculin extract, with the response read 72 hours later and plotted on a scattergram.
For captive cervid herds specifically, the toolkit differs slightly. The official tests for captive cervids are the single cervical test, the comparative cervical test, and the blood tuberculosis test. Captive cervids will not be subjected to a caudal fold retest at intervals of less than 90 days.
| Test | Species | Role | Reading Window |
|---|---|---|---|
| Caudal Fold Test (CFT) | Cattle, bison | Primary screening test | 72 ± 6 hours |
| Comparative Cervical Test (CCT) | Cattle, bison, cervids | Secondary/confirmatory test | 72 hours |
| Gamma Interferon (Bovigam) | Cattle only | Blood-based alternative to CCT | Lab-dependent |
| Single Cervical Test (SCT) | Captive cervids | Primary screening test | 72 hours |
| Blood TB (BTB) Test | Captive cervids | Confirmatory blood test | Lab-dependent |
All of these procedures trace back to the USDA Uniform Methods and Rules for Bovine Tuberculosis Eradication, the same document Connecticut’s statute references by name, and are summarized further in USDA’s APHIS tuberculosis control and eradication guidance.
Interstate and Intrastate Movement Testing Requirements in Connecticut
Bringing cattle, bison, goats, or camelids into Connecticut from another state triggers its own checklist, separate from routine herd testing. According to Connecticut’s published animal importation requirements, cattle must come from a herd negative to a tuberculin test within the past 12 months and included in that herd test, or must have a negative tuberculosis test within 60 days of movement, with the test date recorded on the certificate of veterinary inspection. Cattle from herds that have, at any time, been affected with tuberculosis are not eligible for entry into the state.
Import paperwork follows a fairly predictable sequence:
- Contact the Connecticut Department of Agriculture to request an import permit number before the animals leave their state of origin.
- Have an accredited veterinarian issue an Interstate Certificate of Veterinary Inspection 30 days or less prior to entry, with official ID numbers recorded on it.
- Record the import permit number on the certificate, obtained by calling the Connecticut Department of Agriculture or emailing AGR.SVCS@ct.gov.
- Retain a copy of the completed permit and health certificate, since the buyer or importer returns the completed, signed and dated import permit along with a copy of the certificate of veterinary inspection that accompanied the animals into the state.
These steps apply to hooved mammals and camelids such as alpacas and llamas. Horses are the notable exception; equines do not need an import permit and may enter Connecticut on a health certificate paired with a negative equine infectious anemia test within twelve months of entry instead. That distinction matters if your operation mixes cattle with horses or other companion species, similar to how species-specific paperwork applies under the rabies vaccine requirements for ferrets in Connecticut.
Exhibition adds another layer. Connecticut’s 2026 fair and show requirements confirm that all cattle must have a negative TB test within 12 months of the show date. Intrastate movement is governed by the same statutory authority discussed earlier, since the commissioner’s power to require testing at state expense is not limited to animals crossing a state line.
Common Mistake: Assuming a negative TB test alone clears cattle for import. Connecticut also requires the import permit number to be recorded directly on the certificate of veterinary inspection — a test result without that permit number is incomplete paperwork.
What Happens When a Suspect or Positive Result Occurs in Connecticut
A responder on the initial screening test is not a diagnosis. A positive caudal fold test is a preliminary result, and the animal requires additional diagnostic testing, with regulatory veterinarians following up using secondary tests. If the test produces any type of response, you and your veterinarian must immediately notify the APHIS-VS Area Office and state animal health officials.
From there, outcomes branch depending on the confirmatory result: if the follow-up test is negative, no further action is required, but if the animal is classified as a reactor, it is humanely euthanized for necropsy and diagnostic sample testing. A suspect animal is either sent for necropsy and sample testing right away, or remains in the herd under quarantine for a second comparative test after 60 days, and if that second test is still positive or suspect, the animal goes to humane euthanasia and laboratory testing.
Not every responder actually carries bovine TB. Cross-reactions with other mycobacteria mean some animals flag as false positives during whole-herd testing, which is exactly why series testing (screening test followed by confirmatory test) exists before any animal is condemned.
Quarantine and Herd Depopulation Rules in Connecticut
Once a herd has a confirmed positive, Connecticut owners generally face two paths forward. The owner or producer, working with the involved government agencies, can apply for whole herd depopulation or develop a herd test-and-removal plan instead. The right choice depends on how many animals tested positive, the herd’s overall risk profile, and guidance from the State Veterinarian’s office.
If depopulation is required, any condemnation of livestock infected with tuberculosis must comply with the provisions of Section 22-288 of the Connecticut General Statutes, Chapter 433. Indemnity is capped rather than open-ended: the state appraises any condemned registered purebred bovine animal for a sum not exceeding two thousand dollars and any grade bovine animal for a sum not exceeding eleven hundred dollars under the currently codified statute. Compensation is not automatic in every scenario, either.
No animal whose physical condition leaves it with no real value, and no animal that has been in the state less than three months before quarantine, will be paid for by the state — though an award may still be paid for cattle from an officially accredited herd, a modified accredited area, or a herd that has passed two negative tests without subsequent exposure to infection. That last clause is a strong incentive to keep up with routine testing even when you have no immediate reason to suspect disease in your herd.
Key Insight: Depopulation indemnity depends heavily on your herd’s testing history. A documented pattern of clean, on-schedule tests can be the difference between full appraisal value and no compensation at all.
Penalties for Non-Compliance in Connecticut
Skipping or falsifying TB testing carries consequences that extend well beyond an individual animal. Cattle from herds that have ever been affected with tuberculosis are barred from entering Connecticut at all, which effectively locks a non-compliant herd out of interstate sales and purchases until its status is resolved. No herd or flock under quarantine may move or be exhibited, meaning a single unresolved test result can freeze your ability to sell, transport, or show animals at a fair until the quarantine is lifted.
Indemnity rules add a financial penalty layer of their own. As covered above, animals that have been in Connecticut for less than three months before quarantine, or animals with no real market value, receive no state payment if condemned — a real cost for anyone who imports cattle without verifying TB status first.
Important Note: The statutory text reviewed for this article does not spell out a fixed dollar fine or criminal charge specific to bovine TB testing violations in Connecticut. Enforcement mechanics, including any civil penalties tied to falsified certificates or unauthorized testing, are best confirmed directly with the Connecticut Department of Agriculture’s State Veterinarian office before you assume a specific outcome.
These layered consequences mirror how Connecticut enforces other animal-health rules statewide. Compare it to the state’s approach in the dog breed restrictions in Connecticut, where non-compliance similarly triggers restrictions on ownership and movement rather than a single flat fee.
Bovine tuberculosis testing in Connecticut ultimately comes down to three habits: know which classification tier applies to your species, use only the officially recognized tests performed by authorized personnel, and keep your import and show paperwork synchronized with your herd’s actual test history. Staying ahead of each of those points is far cheaper, in both time and indemnity risk, than catching up after a suspect result appears.