Brucellosis Laws in Iowa: What Livestock Owners Need to Know

Brucellosis may be rare in Iowa today, but that hard-won status did not happen by accident — it is the direct result of decades of strict regulation, coordinated testing, and consistent enforcement. If you raise cattle, bison, or other designated animals in the Hawkeye State, understanding the rules that govern brucellosis is not optional. A single compliance gap can trigger quarantine, mandatory slaughter, and criminal penalties.

This article walks you through Iowa’s brucellosis laws from classification status to vaccination requirements, testing protocols, movement rules, reporting obligations, and the consequences of non-compliance — all drawn from Iowa Code Chapter 164 and the Iowa Administrative Code.

What Is Brucellosis and Why It Is Regulated in Iowa

Brucellosis is a contagious bacterial disease caused by organisms of the genus Brucella. It is the contagious, infectious, and communicable disease caused by bacteria of the genus Brucella, also known as Bang’s disease, undulant fever, and contagious abortion. In cattle and bison, the disease primarily causes reproductive failure — including spontaneous abortions, stillbirths, and reduced fertility — leading to significant economic losses for producers.

Beyond livestock, brucellosis is a zoonotic disease, meaning it can spread from animals to humans. People who handle infected animals or consume unpasteurized dairy products are at risk of contracting undulant fever, a debilitating illness with recurring flu-like symptoms. This human health dimension is a central reason why both state and federal governments treat brucellosis as a priority animal disease.

Iowa regulates brucellosis primarily through Iowa Code Chapter 164, which governs bovine animals and other “designated animals.” Current APHIS Veterinary Services disease eradication programs include cooperative State-Federal efforts directed at cattle and swine brucellosis, bovine and cervid tuberculosis, and pseudorabies in swine. Iowa participates fully in this cooperative framework, meaning state rules must meet — and may exceed — federal minimum standards.

For more background on the disease itself, visit our detailed brucellosis overview before diving into the state-specific rules below.

Iowa’s Brucellosis Classification Status

Iowa holds the highest possible brucellosis classification under the federal system. Iowa is a brucellosis-free state. This means no known brucellosis has been detected in Iowa’s bovine herds for well over a decade, and the state has maintained full compliance with USDA surveillance requirements.

Under the federal classification framework, the classifications are Class Free, Class A, Class B, and Class C; states or areas that do not meet the minimum standards for Class C status are required to be placed under Federal quarantine. Iowa sits at the top of this hierarchy. Restrictions on moving cattle and bison interstate become less stringent as a state or area approaches or achieves Class Free status.

Iowa’s own statute defines “Class Free state” clearly. A “class free state” means there has been no known brucellosis in bovine animals for a period of twelve months, and a state is classified as class free, class A, class B, and class C, according to guidelines set forth in 9 C.F.R. §78.1.

Iowa was officially reclassified from Class A to Class Free status by federal rule effective July 14, 1997. The USDA adopted a final rule changing the classification of Iowa from Class A to Class Free, having determined that Iowa meets the standards for Class Free status. The state has maintained that status ever since, which is a direct result of the regulatory requirements described throughout this article.

Despite this favorable standing, Iowa law still declares the entire state a brucellosis eradication area. This state is declared to be a brucellosis eradication area. That declaration keeps the full framework of testing, vaccination, quarantine, and enforcement authority intact and ready to respond if the disease were ever reintroduced.

If you manage livestock in neighboring states, it is worth reviewing how their classification status affects animals entering Iowa. See our guides on brucellosis laws in Nebraska and brucellosis laws in Minnesota for comparison.

Vaccination Requirements in Iowa

Because Iowa is brucellosis-free, routine mandatory calfhood vaccination programs are no longer universally required for all Iowa-born cattle. However, vaccination remains a recognized tool under Iowa law, and the rules governing how and when it may be used are still active and important.

Under Iowa Code Chapter 164, female designated animals may be vaccinated according to USDA-approved procedures. Native female designated animals other than bovine animals may be vaccinated as provided by rules adopted by the department of agriculture and land stewardship. For bovine animals specifically, vaccination must follow USDA-approved protocols and is administered by a licensed accredited veterinarian.

When a bovine animal is officially vaccinated, proper identification is mandatory. Officially vaccinated purebred registered cattle must receive a vaccination tattoo and either an official vaccination tag or a purebred identification tattoo, and the vaccination tattoo and vaccination tag number or the purebred identification tattoo shall be evidenced on the official certificate of vaccination.

Calfhood vaccination status is also a key factor in movement eligibility. Any calfhood vaccinated females under 24 months of age and not pregnant may be sold when accompanied by an official Certificate of Veterinary Inspection listing official individual identification with no test required; if pregnant, the animal must be tested regardless of their age.

• Vaccination must be performed by a licensed accredited veterinarian authorized by the Iowa Department of Agriculture and Land Stewardship (IDALS)
• All vaccinated animals must receive an approved identification tag inserted in the right ear
• Official vaccination tattoos must appear on the certificate of vaccination
• Calfhood vaccination status can exempt eligible heifers from pre-movement testing under certain conditions
• The department may adopt rules governing vaccination procedures and may implement procedures jointly approved by state and federal animal health officials

Testing Requirements for Cattle and Bison in Iowa

Iowa’s testing framework is built around two scenarios: testing required for animals already within the state and testing required as a condition of entry from outside Iowa. Understanding both is essential for any livestock operation.

Testing of Iowa-Origin Animals

Iowa law gives the Department of Agriculture and Land Stewardship broad authority to order testing. An owner shall allow the owner’s designated animals to be tested when ordered by the department or a representative of the department. If you refuse to cooperate, the department has authority to act. The owner shall confine and restrain the designated animal in a suitable place so that a test can be conducted; if the owner refuses to confine and restrain the designated animal, after a reasonable time the department may employ sufficient assistance to properly confine and restrain the designated animal.

At livestock markets, testing obligations apply before sale. All animals classified to be tested shall be tested prior to sale. All brucellosis tests shall be reported on the regular brucellosis test form 4-33, and blood samples of all animals tested shall be forwarded to the State-Federal Animal Health Laboratory.

After a test is conducted, the results must be shared with the owner. A veterinarian or the department shall provide a report to the owner of a designated animal showing the results of an official test, and the report may be a copy of a test chart. An animal purchased at an auction market may also be officially tested on the auction market premises at the new owner’s request and expense, but this official test must be made within twenty-four hours from the time of sale.

Testing Requirements for Imported Cattle and Bison

Iowa’s importation rules under Iowa Administrative Code Chapter 65 set out specific brucellosis testing requirements for animals entering the state. A negative brucellosis test is required within 30 days prior to importation for cattle or bison six months of age or older that are not exempted.

Several categories of animals are exempt from this pre-import brucellosis test requirement:

• Cattle or bison native to and originating from a certified brucellosis-free herd
• Cattle and bison that are steers or spayed heifers
• Beef-type cattle and bison between 6 and 18 months of age being imported for feeding purposes
• Calfhood-vaccinated heifers meeting applicable age and pregnancy criteria

For animals such as goats and cervidae, separate brucellosis testing timelines apply. Goats must be from a state certified brucellosis-free herd or have a record of a negative brucellosis test performed within 90 days of the exhibition. Cervidae that originate outside Iowa which are six months of age or older must also have been tested negative for brucellosis within 90 days of exhibition, or originate from a certified brucellosis-free cervid herd.

Brucellosis tests of cattle and bison shall be conducted by state or federal laboratories or by approved laboratories under the supervision of the chief livestock health official of the state of origin. Tests conducted at unapproved facilities will not satisfy Iowa’s entry requirements.

Interstate and Intrastate Movement Rules in Iowa

Iowa’s movement rules differ depending on whether animals are traveling within the state (intrastate) or crossing state lines (interstate). Both sets of rules are shaped by Iowa’s Class Free status.

Interstate Movement — Importing Animals Into Iowa

All cattle and bison entering Iowa must be accompanied by a Certificate of Veterinary Inspection (CVI). No animal that is affected with, or that has been recently exposed to, any infectious, contagious or communicable disease or that originates from a quarantined area shall be shipped or in any manner transported or moved into Iowa, unless approved by the state veterinarian.

The rules for brucellosis specifically distinguish animals by the classification of their state of origin:

The Certificate of Veterinary Inspection must be issued by an accredited veterinarian within 30 days prior to the date of entry and must indicate that the veterinarian has inspected the animals and that they are apparently free from symptoms of any infectious or communicable disease.

Animals from states not classified as brucellosis-free that are entering for exhibition purposes face an additional requirement. All cattle originating from states not classified as “free” for brucellosis must have been issued a preentry permit from the state veterinarian’s office.

Intrastate Movement Within Iowa

For movement of animals within Iowa, the commingling rules are a key compliance point. An owner shall not sell or transfer ownership of a designated animal, allow the commingling of designated animals belonging to two or more owners, or allow the commingling of designated animals with other designated animals under feeder quarantine on a state-approved premises, unless the commingled designated animals are accompanied by a negative brucellosis test report issued by a veterinarian.

At approved auction markets, animals are classified according to their brucellosis health status before sale. Markets are classified according to their physical facilities and equipment available to receive, handle, and maintain the identity and the brucellosis health status of cattle marketed, and are designated as Class “A” — those approved to receive all classes of cattle including known brucellosis reactors — and Class “B” — those approved to receive only cattle not known to be brucellosis infected.

For livestock operations in Iowa that also involve other animal types, you may find our guides on goat ownership laws in Iowa and backyard chicken laws in Iowa useful for understanding broader livestock regulation in the state.

Reporting and Quarantine Requirements in Iowa

Iowa’s reporting and quarantine rules are among the most consequential provisions in Chapter 164. If brucellosis is detected in your herd, the response is immediate, mandatory, and tightly controlled.

Reporting Obligations

Any person who discovers the existence of an infectious or contagious disease affecting animals in the state has a duty to report it in writing to the State Veterinarian at the Iowa Department of Agriculture and Land Stewardship. The State Veterinarian then takes such action as deemed necessary for the suppression and prevention of the disease.

At the market level, weekly reporting requirements apply to bovine animals. Each report shall cover all bovine animals identified during the preceding week, and must include the back-tag number and date of application, as well as the type of bovine animal involved.

Quarantine Procedures

When a brucellosis reactor is identified, quarantine is automatic and comprehensive. Quarantine means the entire herd of designated animals must be confined to a premises designated by the department, if any reactor is disclosed.

A lot or group of designated animals in which reactors have been disclosed shall be under quarantine along with any designated animal from which the lot or group originated or commingled. The department may issue any quarantine order deemed necessary for the control and eradication of brucellosis and the proper enforcement of this chapter.

Owners of animals tested for brucellosis shall hold the entire herd on the premises until the results are known, and notice of quarantine shall be delivered in writing by the department or its authorized agent to the owner or caretaker of all cattle quarantined.

The quarantine marking of reactor animals is also mandatory. A designated animal that is quarantined as a result of a test for brucellosis shall be plainly and permanently marked for identification by a veterinarian making the test in a manner authorized by the department and to the extent applicable by the United States Department of Agriculture.

Disposal of Reactor Animals

Once quarantined reactor animals are identified, the timeline for disposal is strict. When a written order has been issued by the department or its authorized representative for the removal of a quarantined designated animal to slaughter, the designated animal shall be tagged and handled within fifteen days after the date of testing; within thirty days the designated animal shall be moved and slaughtered under the direct supervision of a duly authorized agent or representative of the USDA at a time and place designated by the department.

A designated animal quarantined because of brucellosis shall be disposed of by its owner within a period not to exceed forty-five days from the date on which blood samples were drawn disclosing it as a reactor.

After disposal, the premises must be cleaned and disinfected. After any disclosure of reactors to the brucellosis test and following their disposal for slaughter, the owner of such cattle shall be required to clean and disinfect all barns and premises in which said cattle have been held, and such cleaning and disinfection shall be done in accordance with instructions and with a disinfectant approved by the department.

In cases of genuine hardship, the department has limited flexibility. In case of hardship, the department may upon investigation of the case alter a quarantine order to the extent that the department determines that it is necessary to alleviate the hardship and protect the industry and prospective purchasers.

To see how neighboring states handle quarantine and reporting, review our articles on brucellosis laws in Missouri and brucellosis laws in Michigan.

Penalties for Brucellosis Violations in Iowa

Iowa law takes brucellosis violations seriously, and the penalties extend beyond fines to include criminal liability, mandatory animal disposal, and loss of indemnification rights.

Criminal Penalties

A person guilty of violating a provision of this chapter is guilty of a simple misdemeanor. Under Iowa law, a simple misdemeanor is punishable by up to 30 days in jail, a fine, or both. While this may appear modest, each individual act of non-compliance can constitute a separate violation, meaning repeated or ongoing infractions can multiply quickly.

Civil Penalties and License Actions

Beyond criminal liability, Iowa Code Chapter 163 — which governs infectious and contagious diseases generally — authorizes civil penalties and injunctive relief for violations. The department may impose civil penalties and refer cases for further enforcement action. For licensed dealers and market operators, failure of a licensee or permittee to comply with this chapter or a rule made pursuant to this chapter is cause for revocation by the secretary of the permit or license after notice to the alleged offender and the holding of a hearing by the secretary.

Loss of Indemnification

One of the most significant financial consequences of non-compliance is the potential loss of indemnification. Iowa maintains a brucellosis and tuberculosis eradication fund that can compensate owners whose animals must be slaughtered as reactors. However, this compensation is not guaranteed to non-compliant owners.

For grade animals and purebred animals, the indemnity paid by the fund has historically been capped. If purebred cattle are purchased and owned for at least one year before testing and the owner can verify the actual cost, the department may provide additional indemnification, but this amount shall not exceed a set ceiling or the actual purchase cost, whichever is less. Owners who fail to comply with testing, reporting, or quarantine rules risk forfeiting eligibility for these payments entirely.

Prohibited Acts

Iowa Code Chapter 164 specifically identifies several unlawful acts that can trigger penalties:

• Selling or transferring ownership of a designated animal without required test documentation
• Moving a quarantined animal without a department-issued permit
• Failing to confine and restrain animals when ordered to do so for testing
• Commingling quarantined reactor animals with non-quarantined animals
• Failing to dispose of a reactor animal within the 45-day statutory deadline
• Importing designated animals without the required Certificate of Veterinary Inspection or pre-entry permit

Understanding these penalties in context with Iowa’s broader animal law framework can help you stay compliant. For related regulatory topics, see our guides on roadkill laws in Iowa, leash laws in Iowa, and beekeeping laws in Iowa. If you manage operations in multiple states, our article on brucellosis laws in Nevada and the broader United States laws on exotic pets may also be relevant to your compliance planning.

Conclusion

Iowa’s brucellosis-free status is one of the livestock industry’s genuine success stories, but it requires constant vigilance to maintain. As a livestock owner or operator in Iowa, you are part of that system. Your obligations include allowing ordered testing, following importation documentation requirements, complying with vaccination and identification rules, reporting suspected disease, and adhering strictly to quarantine and disposal timelines if a reactor is ever identified.

Violations are not treated lightly — criminal misdemeanor charges, civil penalties, license revocations, and loss of indemnification are all real consequences. The best approach is to work closely with a licensed accredited veterinarian, keep documentation current, and contact the Iowa Department of Agriculture and Land Stewardship (515-281-5547) whenever you have questions about a specific situation. Staying informed and proactive is the most effective way to protect your herd, your operation, and Iowa’s brucellosis-free standing.