Bovine Tuberculosis Testing Requirements in Pennsylvania Cattle Owners Need to Know
August 28, 2026
Pennsylvania has held Tuberculosis Free status for cattle since June 2000, but that designation didn’t happen by accident, and it doesn’t maintain itself. Bovine tuberculosis testing requirements in Pennsylvania still apply to hundreds of enrolled herds, thousands of animals moved across state lines each year, and every producer who wants to sell, show, or transport livestock. Understanding who has to test, which methods are approved, and what happens if a suspect result turns up can save a herd owner from costly delays or worse.
This breakdown walks through the state’s classification status, testing obligations, movement rules, and the penalties that apply when someone skips a required step. Whether you run a small dairy operation or manage a commercial cattle herd, the rules below determine how you move, sell, and document your animals.
What Is Bovine Tuberculosis and Why It Is Regulated in Pennsylvania
Bovine tuberculosis is caused by Mycobacterium bovis, a bacterium closely related to the human and avian strains of TB. According to the Pennsylvania Department of Agriculture, bovine TB caused by M. bovis can be transmitted from livestock to humans and other animals, and no other TB organism affects as wide a range of warm-blooded species. That host range is exactly why regulators treat it so seriously: the same bacteria that sickens a dairy cow can spread to goats, swine, cats, dogs, and farmworkers who handle infected tissue or drink unpasteurized milk.
The disease is also difficult to catch early. Infected cattle are typically asymptomatic, and detection usually occurs during live animal skin testing or, more commonly, at slaughter through the national carcass inspection program. Because sick-looking animals aren’t a reliable warning sign, routine testing and slaughter surveillance are the primary tools that keep the disease from spreading unnoticed through a herd.
Bird owners sometimes confuse bovine TB with the poultry version of the disease. They’re related but distinct conditions with different regulatory pathways; the differences are covered in more detail in this avian tuberculosis overview. For cattle producers, the Pennsylvania program that governs testing sits under the Bureau of Animal Health and Diagnostic Services’ Division of Animal and Poultry Health, which develops the test schedules and enforcement standards discussed throughout this guide.
Pennsylvania’s TB Classification Status and Risk Zones
Pennsylvania’s classification is the foundation for every testing rule that follows. The Pennsylvania Department of Agriculture confirms that the Commonwealth obtained Tuberculosis Free Status under the national eradication program in June 2000, a status that has held ever since for cattle and bison. That classification carries real economic weight, since TB Free status has had a significant economic impact on the state’s animal industry in both domestic and international markets, largely by reducing the testing burden required to move animals across state lines.
Federal tuberculosis regulations under 9 CFR Part 77 list Pennsylvania among the modified accredited states for the separate captive-cervid herd classification, which runs on different qualifying criteria than the cattle and bison program. In practical terms, that means a farm’s obligations can differ depending on whether it raises cattle, goats, or farmed deer and elk, so it’s worth confirming your specific classification with the Bureau before assuming your neighbor’s rules apply to your operation.
Important Note: No wild deer in Pennsylvania have tested positive for bovine TB to date, according to the Pennsylvania Game Commission, which sets Pennsylvania apart from states like Michigan and Minnesota where the disease persists in free-ranging deer populations.
This disease has not been diagnosed in Pennsylvania’s wild deer herd to date, which removes a major reinfection risk that complicates eradication efforts elsewhere. Hunters who spend time in the woods play a role in that surveillance too; deer health monitoring ties directly into the state’s broader wildlife disease tracking covered under Pennsylvania hunting license requirements.
Who Must Test and Which Animals Are Covered in Pennsylvania
Not every cattle owner in Pennsylvania is required to test routinely, but a large voluntary and semi-mandatory network keeps the state’s surveillance numbers high. As of the most recent reporting from the Department of Agriculture, Pennsylvania has 309 active bovine herds enrolled in the accreditation program, 102 accredited caprine herds, and 232 accredited cervid herds. Total statewide surveillance is estimated at close to 900,000 cattle tested per year, with accredited veterinarians performing most of that testing rather than state or federal officials directly.
Coverage extends across several species-specific programs:
- Accredited Cattle and Goat Herd Program – voluntary enrollment for dairy and beef operations plus goat herds seeking accredited status
- Accredited, Qualified, and Monitored Cervid Herd Programs – separate tiers for farmed deer, elk, and other captive cervids
- Slaughter surveillance – carcass inspection at every federal and state-inspected plant, regardless of herd enrollment status
- Movement-triggered testing – animals crossing state lines for sale, show, or breeding purposes
Federal accreditation standards also set age thresholds for herd testing. Under the Uniform Methods and Rules, accreditation or reaccreditation testing in Accredited Free states or zones must include all cattle or bison 24 months of age and older, as evidenced by the loss of the central deciduous incisors. Younger animals are generally exempt from routine herd testing unless they’re part of a disease investigation or being sold under a program that requires individual test results regardless of age.
Approved TB Testing Methods in Pennsylvania
Pennsylvania relies on the same tiered testing system used nationwide, starting with a screening test and escalating to confirmatory diagnostics only when a screening result comes back suspicious. The Pennsylvania State University Extension explains that in the field, the screening test is a tuberculin skin test, typically a caudal tail fold skin test, where an accredited veterinarian injects 0.1 ml of tuberculin intradermally and checks the site roughly three days later for swelling.
| Test | Type | Typical Timing | Purpose |
|---|---|---|---|
| Caudal Fold Test (CFT) | Intradermal skin test | Read at 72 (+/- 6) hours | Primary screening test for herds and individual animals |
| Comparative Cervical Test (CCT) | Intradermal skin test | Within 10 days of CFT, or after a 60-day wait | Confirmatory test for CFT suspects |
| Gamma Interferon Assay | Blood test | Blood drawn within 30 days of CFT injection | Alternative confirmatory test (not approved for bison or cervids) |
| Postmortem/Culture | Necropsy and laboratory culture | Following slaughter or reactor removal | Definitive diagnosis and lesion confirmation |
Only USDA-licensed tuberculin may be used for official testing. Federal guidance is explicit that officials should use only bovine purified protein derivative tuberculin (PPD bovis) licensed by USDA for official testing, and observation without physical palpation of the injection site isn’t considered acceptable. Veterinarians record every result on VS Form 6-22, and any animal that shows an unusual response is classified as a suspect rather than dismissed.
Pro Tip: Schedule TB testing well ahead of a planned sale or show date. Retests can’t happen until 60 days after a caudal fold injection in most cases, so a delayed or inconclusive result can push back your timeline by two months.
Interstate and Intrastate Movement Testing Requirements in Pennsylvania
Because Pennsylvania holds accredited-free status for cattle, animals originating here generally move with fewer restrictions than livestock from states with lower classifications. Federal regulations state that cattle or bison originating in an accredited-free state or zone may be moved interstate without further restriction under 9 CFR part 77, though the receiving state can still impose its own paperwork requirements.
Bringing animals into Pennsylvania is a different story. State regulations require a valid health document for every animal entering the Commonwealth. Under Pennsylvania Code, interstate health certificates must include current disease test dates and results, along with the herd health status of the herd of origin when required. Since 2018, the Department has stopped accepting the free online APHIS Form 7001 for this purpose, so producers need an accredited veterinarian to issue an official CVI or the state’s AAI-13 Pennsylvania health certificate instead, as detailed on the Department’s domestic animal import requirements page.
Anyone hauling cattle across state lines should also review Pennsylvania livestock trailer requirements, since transport equipment and paperwork violations often get flagged at the same inspection points as disease documentation. Horse owners moving equids face a parallel system worth comparing, covered in the guide to EIA Coggins test requirements in Pennsylvania.
What Happens When a Suspect or Positive Result Occurs in Pennsylvania
A suspect reading on a caudal fold test doesn’t mean an animal has bovine TB. False positives happen because other bacteria, including those behind Johne’s disease and environmental mycobacteria, can trigger a similar reaction. The Ohio State University College of Veterinary Medicine notes that with tests like the CFT operating at less than perfect specificity, a second, more specific test is performed on the positive animals only to reduce the number of false positives before any drastic action is taken.
Once a suspect is flagged, Pennsylvania’s veterinarian is required to act quickly. Federal protocol calls for follow-up CCT testing within 10 days of the initial caudal-fold injection, or a 60-day wait before a follow-up CCT can be administered, with the gamma interferon test requiring blood drawn within 30 days of the original injection. If either confirmatory test comes back positive, the animal is classified as a reactor and all further herd testing shifts to federal or state regulatory veterinarians rather than the private accredited vet who ran the initial screen.
- Screening test (CFT) performed by an accredited veterinarian
- Suspect result reported to the state and federal animal health officials
- Confirmatory testing via CCT or gamma interferon assay
- Reactor classification if confirmatory test is positive
- Herd quarantine established immediately upon reactor disclosure
Quarantine and Herd Depopulation Rules in Pennsylvania
Pennsylvania regulations move fast once a reactor is confirmed. Under state code, when a tuberculosis reactor or suspect is disclosed, the veterinarian applying the test must establish a quarantine on the entire herd, not just the individual animal. Reactor animals are tagged with a red metal reactor tag and physically branded with a hot iron “T” on the left jaw, a practice the code explicitly states isn’t considered animal cruelty.
Disposal timelines are strict. State rules require that reactor animals must be disposed of within 15 days after appraisal, and there’s no salvage value for a reactor unless the meat can be slaughtered and cooked to meet federal inspection standards. Negative animals in a quarantined herd can’t leave the property without a written permit, and milk from negative or suspicious animals in a quarantined herd must be pasteurized before any human or animal consumption.
At the national level, APHIS confirms that when health officials find tuberculosis in a herd, it is managed by either depopulating the herd or by testing and removing reactor animals, since the disease has no approved treatment in livestock. Retesting after a quarantine can’t begin until 60 days have passed following the previous test, and only after reactors are removed and the premises are properly cleaned and disinfected.
Common Mistake: Assuming a herd can resume normal sales or shipping the moment reactors are removed. Retest scheduling, disinfection sign-off, and permit approval from the Bureau all have to happen first, and skipping ahead can extend the quarantine rather than shorten it.
Penalties for Non-Compliance in Pennsylvania
Refusing to comply with testing or quarantine orders in Pennsylvania carries real legal exposure. State code makes clear that it is unlawful for a person to interfere or refuse to confine animals to allow testing by officers or agents of the Department after reasonable notice has been given. The Commonwealth also reserves the right to test any animal for tuberculosis at any time, regardless of a herd’s prior test history.
Enforcement runs through Pennsylvania’s Domestic Animal Law. Departmental notices describing violations of comparable quarantine and testing orders confirm that penalties under the Domestic Animal Law include revocation of license, criminal prosecution, civil penalties of up to $10,000 per violation, injunctive relief, or any combination of these. Animals moved into or within Pennsylvania in violation of the state’s health certificate and testing requirements can also be held in quarantine at the owner’s expense until the Department releases them.
Beyond the direct legal risk, non-compliance can jeopardize a herd’s accredited status entirely. The state’s regulations note that disclosure of tuberculosis in an accredited herd is sufficient justification for revocation or suspension of that herd’s free status, which can affect sale value and movement privileges long after the immediate quarantine ends. Producers who also handle other regulated animals, such as those managing on-farm cats or dogs exposed to livestock areas, should review related compliance obligations like Pennsylvania rabies vaccine requirements, since multiple animal health programs often intersect on working farms.
Staying compliant ultimately comes down to working closely with an accredited veterinarian, keeping health certificates current, and responding immediately to any testing notice from the Bureau of Animal Health and Diagnostic Services. Pennsylvania’s TB Free status has held for more than two decades because producers and regulators both treat these requirements as non-negotiable, and that track record is worth protecting whether you’re managing three head of cattle or three hundred.