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Short answer: USDA still requires premovement bird-flu testing for many lactating dairy cattle traveling across state lines, but not every cow and not in every state. As of August 12, 2026, cattle originating in states with National Milk Testing Strategy (NMTS) Unaffected State Status can move interstate without individual premovement H5N1 testing. Cattle from Affected or Provisionally Unaffected states generally remain subject to the federal testing rule.
The requirement began with an April 24, 2024 Federal Order from USDA’s Animal and Plant Health Inspection Service (APHIS). An April 27, 2026 guidance update created the state-status-based exemption. The rule concerns animal movement, disease surveillance, reporting, and traceability—not a finding that the commercial pasteurized milk supply is unsafe.
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The rule in one sentence
Unless a specific exception applies, a lactating dairy cow moving across state lines from an Affected or Provisionally Unaffected state must have a negative, approved Influenza A test collected no more than seven days before movement and must travel with the required veterinary paperwork and official identification.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe word lactating matters. APHIS defines the covered animals as dairy cattle currently in an early, middle, or late lactation phase. The federal premovement-testing requirement does not currently apply in the same way to nonlactating dairy cattle, including heifers, dry cows, and bull calves. State animal-health rules may be stricter.
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Who has to test—and who does not?
| Animal or movement | Federal premovement test | Important conditions |
|---|---|---|
| Lactating dairy cattle from an Affected state | Generally required | Negative approved test, generally collected within seven days of movement, plus a Certificate of Veterinary Inspection and official identification. |
| Lactating dairy cattle from a Provisionally Unaffected state | Generally required | The provisional designation does not provide the April 2026 testing exemption. |
| Lactating dairy cattle from an NMTS Unaffected state | Not required under the federal premovement rule | The exemption is based on the state’s current status. CVIs, identification, and state-specific requirements can still apply. |
| Nonlactating dairy cattle, such as heifers, dry cows, and bull calves | Not currently required by this federal rule | State and destination requirements may still apply. |
| Nonclinical lactating cattle going directly to slaughter | Not required before that movement | The cattle still need a CVI or other documentation approved by the sending and receiving state animal-health officials. |
| Lactating cattle showing clinical signs | Testing does not make the movement eligible | Clinically ill lactating cattle are ineligible for interstate movement and for movement to slaughter. |
This is why the shorthand statement that “USDA requires every dairy cow to be tested before transport” is misleading. The federal order is focused on covered lactating cattle making covered interstate movements, and the April 2026 update makes the requirement dependent on the originating state’s NMTS status.
How the required test works
Use an approved laboratory and assay
The result must come from an approved laboratory in the National Animal Health Laboratory Network (NAHLN). APHIS guidance identifies NAHLN-approved PCR testing that includes an Influenza A matrix target and an H5 target. Testing for clade 2.3.4.4b may also be included.
Although this is commonly described as a “H5N1” or “bird-flu” test, the operational requirement is a negative approved Influenza A test meeting APHIS’s assay and laboratory requirements. An unapproved rapid test or an informal farm screening result should not be treated as a substitute for the required NAHLN result.
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Meet the seven-day collection window
Samples must be collected no more than seven days before the cattle move. A result outside that window generally will not satisfy the federal premovement requirement, even if the test was negative.
Know how many animals to sample
- Lots of 30 or fewer lactating dairy cattle: every animal in the lot must be tested.
- Lots larger than 30: 30 animals must be tested.
For this purpose, a lot is the group of covered cattle moving as part of the shipment. The sampling rule does not mean that a producer can combine samples from multiple cows and submit one unidentified mixture.
Understand the milk-sample procedure
Milk or udder-secretions samples are collected from each individual animal. Each quarter is sampled, and the material from that animal is combined into one submission of approximately 3 to 10 milliliters per animal. Any laboratory pooling occurs at the laboratory, not on the farm.
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- an accredited veterinarian;
- a state-licensed veterinarian;
- a sample collector approved by the relevant State Animal Health Official; or
- designated production-site personnel when they have been trained and are supervised as required by the state.
Who pays?
APHIS reimburses NAHLN laboratories for the laboratory testing itself, so the current program provides the testing at no cost to the producer or submitter. APHIS’s guidance does not provide reimbursement for sample collection or shipping. Producers may therefore still incur veterinary, labor, packaging, or transportation expenses.
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The April 2026 exemption: what “Unaffected” means
On April 27, 2026, APHIS updated its implementation guidance to exempt lactating dairy cattle originating in states with NMTS Unaffected State Status from individual premovement H5N1 testing. This was not a nationwide repeal of the 2024 Federal Order. It is a conditional exemption tied to the disease status of the state of origin.
The NMTS uses three state classifications:
- Affected: surveillance demonstrates the presence of H5 in the state’s dairy cattle.
- Provisionally Unaffected: a state is phasing into the program and has met the applicable interim conditions, but it does not yet have the full Unaffected designation.
- Unaffected: ongoing testing and surveillance demonstrate the absence of H5 in the state’s dairy cattle.
A state’s status is not necessarily permanent. A Provisionally Unaffected state may lose that designation if a new dairy-cattle case is confirmed within the previous 30 days or if the testing needed to demonstrate disease absence has not been completed. A state can also change status as surveillance produces new evidence.
Before shipment, the producer, veterinarian, and receiving party should check the originating state’s current NMTS classification and both states’ movement rules. The relevant question is not simply whether the cow tested negative at some earlier point; it is whether the movement qualifies under the rules in force on the date it occurs.
Paperwork and identification still matter
All interstate movement of lactating dairy cattle must be accompanied by a Certificate of Veterinary Inspection (CVI) under 9 CFR Part 86, along with the cattle’s individual official identification recorded on the certificate. The CVI must state that the animals are free from, and have not been exposed to, a known contagious and infectious disease.
The Unaffected-state exemption removes the federal individual premovement-testing requirement. It does not automatically remove the CVI, identification, health-attestation, destination, or state-specific requirements.
A veterinarian or provider of livestock movement compliance services may help organize certificates, identification records, testing documentation, and shipping details. Such assistance cannot replace the authority of the sending and receiving State Animal Health Officials, and it cannot authorize a movement that APHIS or a state prohibits.
Special movement situations
Direct movement to slaughter
Nonclinical lactating dairy cattle moving interstate directly to slaughter do not need the federal premovement test. They must still move under a CVI or other documentation approved by the sending and receiving state animal-health officials.
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This exception does not apply to cattle with clinical signs. APHIS says lactating dairy cattle showing clinical signs are ineligible for interstate movement and are also ineligible for movement to slaughter.
Shows, exhibitions, and sales
Movement to a show, exhibition, or sale remains subject to the applicable testing and certificate requirements. APHIS says cattle moving interstate for one of these purposes must have a negative result from samples collected within seven days of movement.
The same result may be used for the return trip if the event does not last more than 10 days. Longer events or changed circumstances may require new testing or additional documentation, so the exhibitor should confirm the return requirements before leaving the event.
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Positive results and herd restrictions
If a herd has a positive Influenza A result, lactating dairy cattle from that herd generally cannot move interstate for 30 days from the most recent collection of a positive sample from any individual animal in the herd.
After the 30-day period, cattle must be tested again before movement under the applicable requirements. An exceptional cross-state movement involving test-positive cattle requires agreement from the relevant State Animal Health Officials and APHIS. A positive result should therefore be handled through the herd veterinarian and animal-health officials rather than by attempting to ship cattle under an ordinary negative-test certificate.
A negative result is an important movement-control measure, but it is not a guarantee that an animal is permanently free of infection. The test reflects the sample and timing, which is why APHIS combines testing with movement controls, reporting, herd investigations, and ongoing surveillance.
Why USDA adopted the requirement
APHIS describes highly pathogenic avian influenza H5N1 as an emerging disease of cattle. Genetic and epidemiologic analyses indicate that most livestock outbreaks were associated with spillover from wild birds to dairy cattle, with some subsequent dairy-to-dairy and dairy-to-poultry spread.
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The virus can be shed in milk at high concentrations. Contaminated milk, milking equipment, vehicles, animals, and other materials can provide opportunities for spread between premises. Premovement testing is intended to reduce the chance that infected cattle silently travel to another state and to improve traceability when a positive result is found.
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APHIS’s movement order rests on the federal authority provided by the Animal Health Protection Act, which allows the agency to restrict or prohibit animal movement in commerce when necessary to protect animal health. The Congressional Research Service has summarized the same central operating features: use of an approved NAHLN laboratory, the seven-day collection window, testing every animal in lots of 30 or fewer, and testing 30 animals in larger lots.
How this fits into USDA’s broader response
The cattle-movement rule is one part of a larger federal response. In December 2024, USDA issued an additional Federal Order requiring entities that send or hold raw milk for pasteurization to provide samples for Influenza A testing when requested. Laboratories and state veterinarians must report positive results under that order.
The National Milk Testing Strategy uses several kinds of evidence, including:
- monitoring milk at processing-plant silos;
- assigning and updating state status;
- detecting and responding to disease in affected states;
- demonstrating the absence of H5 in states seeking Unaffected status; and
- working toward evidence of long-term H5 freedom in the national dairy herd.
USDA describes the NMTS as a staged program intended to continue until all states reach the final stage and the United States can demonstrate freedom from H5 in the national dairy herd. That long-term goal explains why the rules emphasize both individual movement decisions and population-level surveillance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does the rule mean pasteurized milk is unsafe?
No. The premovement rule is an animal-health and disease-control measure. It is not a declaration that the commercial pasteurized milk supply is unsafe.
APHIS says milk from affected animals is diverted or destroyed before entering the food supply, and that pasteurization effectively inactivates H5N1 virus. The FDA’s assessments continue to support the effectiveness of pasteurization against infectious H5N1 in dairy milk. FDA also reports that its retail testing has not detected infectious virus in the sampled pasteurized dairy products.
The advice about raw milk is different. FDA continues to advise against consuming raw milk because it can contain disease-causing pathogens and because the safety of raw milk from infected cows is not established. Pasteurization is the key distinction; consumers should not assume that raw milk has the same safety profile as pasteurized milk.
CDC characterizes the current public-health risk as low while continuing to monitor occupational exposures and sporadic infections among people who have been exposed to infected animals. Farmworkers and others who handle potentially infected cattle or materials should follow workplace, veterinary, and public-health guidance.
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What producers should verify before shipping
- Confirm the animal category. Is the animal currently lactating, or is it a heifer, dry cow, or bull calf?
- Confirm the route. Is the movement crossing a state line? If it is a direct movement to slaughter, confirm that the cattle are nonclinical and that the states accept the required documentation.
- Check the originating state’s NMTS status on the shipment date. Unaffected status may remove the federal individual-testing requirement; Affected and Provisionally Unaffected status generally do not.
- Check both states’ requirements. State rules can add requirements even when federal testing is not required.
- Arrange the correct sample collection. Use an authorized collector, sample each quarter, and submit the required 3–10 mL combined sample for each animal.
- Use an approved NAHLN laboratory and assay. Confirm that the test includes the required Influenza A matrix and H5 targets.
- Time the collection correctly. Samples must be collected no more than seven days before movement.
- Apply the lot-size rule. Test every animal in a lot of 30 or fewer, or 30 animals in a larger lot.
- Prepare the CVI and identification records. Individual official identification must be recorded, and the certificate must include the required health statement.
- Do not ship clinical or restricted cattle. Address positive results and clinical signs with the herd veterinarian, State Animal Health Official, and APHIS.
For a real shipment, current APHIS guidance and the sending and receiving states’ animal-health offices should control the final decision. NMTS classifications, testing guidance, and movement requirements are subject to change.
What pet owners need to know
This is a cattle-movement rule, not a new testing requirement for household dogs or cats. For the general public, the most important distinction is between disease-control measures on farms and the safety of pasteurized dairy products. Consumers should choose pasteurized milk and dairy products and avoid raw milk, while people who work around dairy cattle should take occupational-exposure precautions seriously.
Frequently Asked Questions
Does every dairy cow need a bird-flu test before transport?
No. The federal requirement generally applies to lactating dairy cattle moving interstate from Affected or Provisionally Unaffected states. Cattle originating in an NMTS Unaffected state are exempt from individual premovement H5N1 testing under the April 2026 update. Nonlactating cattle are not currently covered by the same federal testing requirement, although state rules may apply.
How recent must the dairy-cow test be?
The sample must be collected no more than seven days before the animal moves. For show, exhibition, and sale movements, the negative result may be used for the return trip if the event lasts no more than 10 days.
Who pays for the required test?
APHIS reimburses NAHLN laboratories for the laboratory testing, so the test itself is currently completed at no cost to the producer or submitter. APHIS does not currently reimburse sample collection or shipping costs.
Can a sick lactating cow be shipped if it tests negative?
No. Lactating dairy cattle with clinical signs are ineligible for interstate movement and for movement to slaughter. A negative test does not override that restriction.
Does the USDA rule mean pasteurized milk is unsafe?
No. The rule is aimed at animal movement and disease control. USDA says milk from affected animals is diverted or destroyed, and FDA continues to find that pasteurization effectively inactivates H5N1 in dairy milk. FDA advises against consuming raw milk.
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No test provides a permanent guarantee. A negative result reflects the sample and collection date. That is why APHIS combines premovement testing with surveillance, reporting, movement controls, herd investigations, and biosecurity.
The Bottom Line
Bottom line: As of August 12, 2026, USDA’s dairy-cattle bird-flu testing mandate remains in place, but it is conditional. Lactating cattle moving interstate from Affected or Provisionally Unaffected states generally need a negative approved test collected within seven days, while cattle from NMTS Unaffected states do not need individual premovement H5N1 testing under the federal rule. CVIs, official identification, state requirements, slaughter exceptions, and restrictions involving clinical or positive cattle still matter.
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