# Dairy Cow Biosecurity Plan: Visitor Protocols, Quarantine, and Disease Prevention ## Key Takeaways - Dairy farms should implement a three-zone biosecurity system (Restricted, Controlled, Public Access) with distinct protocols for personnel and vehicle entry, including mandatory boot washing with disinfectant and dedicated farm clothing for the Restricted zone to prevent pathogen introduction. - All visitors must undergo pre-visit screening for recent animal contact and attend a biosecurity briefing, signing a log that details their visit, areas accessed, and recent animal exposure, serving as a critical record for epidemiological tracing. - New and returning animals require a minimum 21-30 day quarantine in a facility at least 30 meters from the main herd, with separate airspace and drainage, and daily health monitoring for clinical signs of disease. - Effective sanitation includes daily footbath maintenance with appropriate disinfectant concentrations and contact times, and rigorous cleaning and disinfection of equipment and water/feed sources to minimize fomite and environmental transmission. - Consistent protocol enforcement, adequate quarantine facilities, proper footbath management, and visitor compliance are critical to prevent common biosecurity failure patterns that can lead to disease outbreaks. - Regular biosecurity audits, daily health observations, and monitoring of milk quality parameters (e.g., SCC) are essential for early detection of potential breaches and for continuous improvement of herd health management strategies. --- Dairy cow biosecurity is the set of management practices designed to prevent the introduction and spread of infectious diseases within a dairy herd. For farmers implementing biosecurity measures, the core challenge is balancing disease prevention with the practical realities of daily farm operations, including visitor access, animal movements, and routine husbandry. This article provides a structured approach to establishing biosecurity zones, managing visitor protocols, implementing quarantine for new animals, and applying sanitation practices to protect herd health. The guidance is based on established veterinary principles and published outbreak management experiences, including integrated plans for leptospirosis control (Epidemiology and Infection, 2014, [PubMed](https://pubmed.ncbi.nlm.nih.gov/23920354)), Salmonella Bredeney outbreak management on an Italian dairy farm (Animals, 2024, [PubMed](https://pubmed.ncbi.nlm.nih.gov/39409724)), and surveillance approaches for [Mycoplasma bovis](/knowledge/bacteria/livestock-bacteria/mycoplasma-bovis) (Preventive [Veterinary Medicine](/blog/careers/veterinary-medicine-careers-from-clinical-practice-to-public-health), 2022, [PubMed](https://pubmed.ncbi.nlm.nih.gov/34774335)). The scope covers practical decisions, record-keeping, welfare considerations, and criteria for escalating to veterinary professionals. ## At a Glance: Biosecurity Zones and Visitor Access A functional biosecurity plan divides the farm into zones based on risk of disease introduction. The following table summarizes the three primary zones, their access rules, and the sanitation measures required for each. | Zone | Description | Visitor Access Rules | Required Sanitation | |------|-------------|---------------------|---------------------| | Restricted Access (Core) | Lactating cow barns, maternity pens, [calf housing](/knowledge/animal-farming/farm-management/calf-housing-hutches-pens-group-systems), and feed storage areas | Only essential personnel with documented training, no visitors without prior approval and a 48-hour animal-free period | Boot wash with disinfectant, dedicated farm clothing or disposable coveralls, hand washing before and after entry | | Controlled Access (Transition) | Farm office, parking area, equipment storage, and outer perimeter of animal housing | All visitors must sign a log, report recent farm or animal contact, and receive a biosecurity briefing | Footbath at entry point, vehicle wheel spray if entering beyond parking, clean boots or boot covers | | Public Access (Perimeter) | Public road, farm entrance gate, and designated visitor parking | No unsupervised access to animal areas, signage directing visitors to check-in point | No direct animal contact, hand sanitizer available at check-in | The zones are defined by physical barriers such as gates, fences, and signage. The Merck Veterinary Manual (Management and Nutrition, [Merck Vet Manual](https://www.merckvetmanual.com/management-and-nutrition)) provides foundational guidance on biosecurity principles for livestock operations. Farmers should map their farm layout and assign each area to a zone, then communicate these boundaries to all staff and regular visitors. ## Defining Biosecurity Zones on the Dairy Farm ### Mapping Farm Layout and Risk Areas The first step in implementing a biosecurity plan is to create a physical map of the farm. Identify all animal housing areas, feed storage, manure handling systems, water sources, and entry points. Assign each area to one of the three zones described in the At a Glance table. The restricted access zone should include all areas where cows, calves, and heifers are housed, as well as feed storage to prevent contamination. The controlled access zone includes the farm office, parking, and equipment storage. The public access zone is the area beyond the farm gate that is accessible to the general public. A large-scale cross-sectional study of 765 German dairy herds (Animals, 2024, [DOI](https://doi.org/10.3390/ani14091385)) highlighted the importance of standardized data collection for epidemiological assessments. Farmers can apply this principle by maintaining a consistent map and updating it whenever facilities change. The map should be posted at the farm entrance and in the office for reference. ### Physical Barriers and Signage Physical barriers are essential for enforcing zone boundaries. Install gates at the transition from public to controlled access and from controlled to restricted access. Use signage that clearly states "Restricted Area: Authorized Personnel Only" and "Biosecurity Zone: Please Report to Office." Signs should include contact information for the farm manager or designated biosecurity officer. The USDA Natural Resources Conservation Service ([NRCS](https://www.nrcs.usda.gov/)) provides technical guidance on [farm infrastructure planning](/knowledge/animal-farming/farm-management/farm-infrastructure-planning-designing-facilities-for-efficiency-and-animal-welfare), including fencing and access control, which can be adapted for biosecurity purposes. ### Color-Coded Equipment and Clothing Assign specific colors to equipment and clothing for each zone. For example, use blue for restricted access areas, yellow for controlled access, and red for public access. This system helps staff and visitors quickly identify which items belong where. Boots, coveralls, and tools should not move from a higher-risk zone to a lower-risk zone without cleaning and disinfection. Implement a "one-way flow" principle where possible: movement should proceed from clean areas (young stock) to dirty areas (mature cows or hospital pens) to reduce pathogen spread. ## Visitor Protocols: Managing People on the Farm ### Pre-Visit Screening and Authorization All visitors, including veterinarians, feed suppliers, equipment technicians, and government inspectors, should be screened before arrival. Require visitors to complete a pre-visit questionnaire that asks about recent contact with other livestock, attendance at livestock events, and any signs of illness in animals they have handled. The questionnaire should be reviewed by the farm manager or designated biosecurity officer. Visitors who have had contact with sick animals or have been on a farm with a known disease outbreak within the past 48 hours should be rescheduled or required to follow enhanced protocols, such as a 72-hour animal-free period. The integrated outbreak management plan for leptospirosis in dairy cattle herds (Epidemiology and Infection, 2014, [PubMed](https://pubmed.ncbi.nlm.nih.gov/23920354)) demonstrates the importance of coordinated human and animal health measures during disease outbreaks. While that study focused on leptospirosis, the principle of pre-visit screening applies broadly to all infectious disease prevention. ### Visitor Log and Record Keeping Maintain a visitor log that records the date, time, name, company or affiliation, purpose of visit, areas accessed, and any recent animal contact. The log should be kept for at least one year and reviewed periodically to identify patterns. For example, if a disease outbreak occurs, the log can help trace potential sources of introduction. The log should be stored in a secure location and be accessible for review by the farm manager or veterinarian. ### Biosecurity Briefing and Sign-Off Before entering the controlled access zone, every visitor must receive a biosecurity briefing. The briefing should cover the farm's zone system, hand washing and boot cleaning procedures, and any specific restrictions for the day (e.g., if a disease outbreak is suspected). Visitors should sign a form acknowledging that they understand and agree to follow the protocols. The briefing can be delivered in person or through a recorded video or written handout. Keep a copy of the briefing materials and signed forms on file. ### Vehicle and Equipment Sanitation Vehicles that enter the controlled access zone, such as feed trucks, milk tankers, and veterinary vehicles, should be cleaned and disinfected before entry. Provide a designated parking area away from animal housing for vehicles that do not need to enter the restricted zone. For vehicles that must enter the restricted zone, such as a veterinary truck for emergency treatment, require wheel washing and disinfection. Equipment brought onto the farm, such as hoof trimming tools or ultrasound machines, should be cleaned and disinfected before and after use. The Merck Veterinary Manual (Management and Nutrition, [Merck Vet Manual](https://www.merckvetmanual.com/management-and-nutrition)) emphasizes that equipment can serve as a fomite for pathogen transmission. ## Quarantine Procedures for New and Returning Animals ### Quarantine Facility Requirements New animals, including purchased cows, heifers, and bulls, as well as animals returning from shows, sales, or veterinary hospitals, must be quarantined before entering the main herd. The quarantine facility should be located at least 30 meters away from the main herd housing, with separate airspace, drainage, and manure handling. The facility should have its own feed and water supply, and equipment used in quarantine should not be shared with the main herd. The quarantine area should be clearly marked with signage and have a footbath at the entrance. ### Duration and Testing Protocol The standard quarantine period is 21 to 30 days, but the exact duration depends on the diseases of concern and the results of diagnostic testing. During quarantine, animals should be observed daily for signs of illness, including coughing, nasal discharge, diarrhea, lameness, and reduced feed intake. A veterinarian should conduct a health examination upon arrival and at the end of the quarantine period. Diagnostic testing should be based on the farm's disease history and regional risks. For example, if [Mycoplasma bovis](/knowledge/bacteria/livestock-bacteria/mycoplasma-bovis) is a concern, testing protocols similar to those used in New Zealand's surveillance program (Preventive Veterinary Medicine, 2022, [PubMed](https://pubmed.ncbi.nlm.nih.gov/34774335)) can inform the approach. The study used scenario tree modeling to plan freedom from infection surveillance, which highlights the importance of targeted testing based on risk assessment. ### Record Keeping for Quarantine Maintain a quarantine record for each animal or group of animals. The record should include the animal identification (ear tag number or RFID), source farm or event, date of arrival, results of any diagnostic tests, daily health observations, and the date of release from quarantine. The record should be signed by the farm manager or designated staff member. If an animal shows signs of illness during quarantine, the record should document the clinical signs, any treatments administered, and the veterinarian's recommendations. ### Managing High-Risk Animals Animals from unknown sources, sale barns, or farms with a history of disease should be considered high risk. For these animals, consider extending the quarantine period to 60 days and conducting additional testing. High-risk animals should be handled last in the daily routine to reduce the risk of pathogen spread to other quarantined animals. If a high-risk animal develops signs of disease, isolate it immediately and consult a veterinarian. The outbreak management plan for Salmonella Bredeney on an Italian dairy farm (Animals, 2024, [PubMed](https://pubmed.ncbi.nlm.nih.gov/39409724)) illustrates how a single introduction can lead to widespread infection if quarantine and biosecurity measures are inadequate. ## Sanitation Practices for Disease Prevention ### Boot and Clothing Sanitation Boots are a primary vector for pathogen introduction. Provide boot wash stations at the entrance to each zone, especially at the transition from controlled to restricted access. The boot wash should contain a disinfectant effective against the pathogens of concern, such as a quaternary ammonium compound or a peroxygen-based product. Boots should be scrubbed to remove organic matter before disinfection, as organic material can inactivate disinfectants. Provide dedicated farm boots for visitors or require disposable boot covers. Clothing should be farm-specific or covered with disposable coveralls. Hand washing with soap and water or an alcohol-based hand sanitizer should be required before and after animal contact. ### Footbath Management Footbaths are a common biosecurity tool but are often mismanaged. Place footbaths at all entry points to the restricted access zone. The footbath should be large enough for a person to step into with both feet and should be at least 15 centimeters deep. Replace the disinfectant solution daily or more frequently if it becomes visibly dirty or contaminated with organic matter. Use a disinfectant that is effective at the recommended concentration and contact time. The footbath should be covered when not in use to prevent dilution from rain or evaporation. Staff should be trained to step into the footbath and remain in contact with the solution for at least 30 seconds. ### Manure and Waste Management Manure is a major reservoir for pathogens such as Salmonella, Mycobacterium avium subspecies paratuberculosis (Johne's disease), and Cryptosporidium. Manage manure to minimize contact with animals and feed. Use separate equipment for manure handling and feed handling, and clean and disinfect equipment between uses. Store manure away from animal housing and water sources. Composting manure can reduce pathogen loads, but the process must be managed correctly to achieve the necessary temperatures. The Merck Veterinary Manual (Management and Nutrition, [Merck Vet Manual](https://www.merckvetmanual.com/management-and-nutrition)) provides guidance on manure management as part of overall herd health. ### Water and Feed Sanitation Water troughs and feed bunks should be cleaned regularly to prevent contamination from feces, urine, and saliva. Clean water troughs at least weekly and more frequently in hot weather or when disease is present. Use a disinfectant safe for drinking water, and rinse thoroughly after cleaning. Feed storage areas should be rodent-proof and protected from birds. Spilled feed should be cleaned up promptly to reduce attraction for wildlife. The USDA Natural Resources Conservation Service ([NRCS](https://www.nrcs.usda.gov/)) offers technical guidance on water quality and feed storage infrastructure. ## Records and Measurements for Biosecurity Monitoring ### Daily Health Observations Record daily health observations for all animals in the herd, including any signs of illness, changes in feed intake, milk production, or behavior. Use a standardized form or electronic record system. The observations should be reviewed by the farm manager or veterinarian at least weekly. A sudden increase in the number of sick animals or a change in the pattern of disease may indicate a biosecurity breach. The large-scale cross-sectional study of German dairy herds (Animals, 2024, [DOI](https://doi.org/10.3390/ani14091385)) emphasized the value of systematic data collection for identifying risk factors and monitoring herd health. ### Visitor and Quarantine Logs Maintain separate logs for visitors and quarantined animals, as described in earlier sections. Review these logs monthly to identify trends. For example, if multiple visitors from the same region or company have accessed the farm, and a disease outbreak occurs, the log can help trace the source. Similarly, if a quarantined animal develops disease, review the log to identify any lapses in protocol. ### Biosecurity Audit Checklist Conduct a biosecurity audit at least quarterly using a standardized checklist. The checklist should cover zone definitions, physical barriers, signage, visitor protocols, quarantine procedures, sanitation practices, and record keeping. Score each item as compliant, non-compliant, or not applicable. Identify areas for improvement and assign responsibility for corrective actions. The audit should be conducted by the farm manager or an external consultant, such as a veterinarian. The results should be shared with staff and used to update the biosecurity plan. ### Milk Quality and Production Records Monitor milk quality parameters, such as somatic cell count (SCC) and total bacterial count, as indicators of herd health. A sudden increase in SCC may indicate an introduction of contagious mastitis pathogens, such as Staphylococcus aureus or Streptococcus agalactiae. Similarly, a drop in milk production or an increase in clinical mastitis cases may signal a biosecurity issue. Review these records in conjunction with health observations and visitor logs to identify potential sources of infection. ## Common Failure Patterns in Dairy Biosecurity ### Inconsistent Protocol Enforcement The most common failure is inconsistent enforcement of biosecurity protocols. Staff may become complacent over time, skipping boot washes or allowing visitors to bypass the check-in process. To address this, designate a biosecurity officer who is responsible for monitoring compliance and providing refresher training. The officer should have the authority to deny access to anyone who does not follow protocols. Regular audits and feedback can help maintain consistency. ### Inadequate Quarantine Facilities Many dairy farms lack a dedicated quarantine facility or use a facility that is too close to the main herd. Inadequate quarantine increases the risk of pathogen transmission through airborne particles, shared equipment, or contaminated runoff. If a dedicated quarantine facility is not feasible, consider using a remote pasture or a separate building that can be isolated. At a minimum, ensure that quarantined animals are housed downwind and downhill from the main herd, and that equipment and personnel are not shared. ### Poor Footbath Management Footbaths are often neglected, with disinfectant solutions left unchanged for days or weeks. A dirty or diluted footbath provides a false sense of security and may actually spread pathogens. Implement a daily footbath maintenance schedule and assign responsibility to a specific staff member. Use a disinfectant that is effective against the pathogens of concern and follow the manufacturer's instructions for concentration and contact time. ### Lack of Visitor Compliance Visitors, especially those who are not regular farm visitors, may resist or forget biosecurity protocols. To improve compliance, make the check-in process simple and clear. Provide a written or video briefing that can be reviewed quickly. Have a staff member escort visitors through the restricted access zone to ensure they follow protocols. If a visitor refuses to comply, deny access and reschedule the visit. ## Welfare and Safety Context ### Animal Welfare During Quarantine Quarantine can be stressful for animals due to social isolation, unfamiliar surroundings, and handling. To minimize stress, provide adequate space, bedding, and ventilation. Ensure that quarantined animals have visual and auditory contact with other animals if possible, but maintain physical separation. Provide a balanced diet and clean water. Monitor for signs of stress, such as reduced feed intake, pacing, or vocalization. If an animal shows signs of severe stress, consult a veterinarian for guidance on environmental enrichment or other interventions. ### Worker Safety Biosecurity protocols should also protect workers from [zoonotic diseases](/knowledge/veterinary-medicine/veterinary-pathology-microbiology/zoonotic-diseases-mechanisms-and-veterinary-public-health), such as leptospirosis, salmonellosis, and cryptosporidiosis. Provide personal protective equipment (PPE), including gloves, boots, and coveralls, and train workers on proper use and disposal. Ensure that hand washing facilities are available and that workers wash hands after handling animals or manure. The integrated outbreak management plan for leptospirosis (Epidemiology and Infection, 2014, [PubMed](https://pubmed.ncbi.nlm.nih.gov/23920354)) highlights the importance of a One Health approach that considers both human and animal health. ### Food Safety Biosecurity measures that prevent disease introduction also protect the safety of milk and meat. For example, preventing Salmonella introduction reduces the risk of milk contamination and human illness. The outbreak management plan for Salmonella Bredeney (Animals, 2024, [PubMed](https://pubmed.ncbi.nlm.nih.gov/39409724)) demonstrates how a single outbreak can have significant economic and public health consequences. Farmers should follow good agricultural practices for milk production, including proper udder hygiene, milk storage, and equipment sanitation. ## Professional Escalation Criteria ### When to Consult a Veterinarian Consult a veterinarian in the following situations: - A quarantined animal develops signs of a notifiable or reportable disease, such as foot-and-mouth disease, [bovine tuberculosis](/knowledge/bacteria/livestock-bacteria/bovine-tuberculosis-diagnostic-tools-wildlife-reservoirs), or brucellosis. - Multiple animals in the main herd develop similar clinical signs within a short period, suggesting a possible disease introduction. - Diagnostic test results indicate the presence of a pathogen that was previously absent from the herd. - A visitor or employee reports a potential exposure to a zoonotic disease. - The biosecurity audit identifies significant gaps that require expert input. ### When to Contact Regulatory Authorities Contact the state or national animal health authority if a notifiable disease is suspected. The veterinarian can provide guidance on reporting requirements and sample submission. Early reporting can help contain outbreaks and prevent spread to other farms. The scenario tree modeling approach for Mycoplasma bovis surveillance (Preventive Veterinary Medicine, 2022, [PubMed](https://pubmed.ncbi.nlm.nih.gov/34774335)) illustrates the importance of coordinated surveillance and response at the regional or national level. ### When to Seek Technical Assistance For complex biosecurity issues, such as designing a new quarantine facility or implementing a comprehensive testing protocol, seek technical assistance from a veterinary extension specialist, a university animal science department, or the USDA Natural Resources Conservation Service ([NRCS](https://www.nrcs.usda.gov/)). These resources can provide site-specific recommendations and help with cost-benefit analysis. ## Frequently Asked Questions ### What is the minimum quarantine period for new dairy cattle? The standard minimum quarantine period is 21 to 30 days, but the exact duration depends on the diseases of concern and the results of diagnostic testing. A veterinarian can help determine the appropriate period based on the farm's risk profile and regional disease prevalence. The quarantine period should be long enough to allow for the incubation of common diseases and for diagnostic test results to be obtained. ### How should I handle a visitor who refuses to follow biosecurity protocols? Deny access to the restricted access zone and reschedule the visit. Explain that biosecurity protocols are in place to protect herd health and that compliance is mandatory. If the visitor is a service provider, such as a veterinarian or feed supplier, discuss the protocols in advance and ensure they have a copy of the farm's biosecurity plan. For government inspectors or regulatory officials, contact the relevant authority to discuss alternative arrangements. ### What disinfectant should I use in footbaths? The choice of disinfectant depends on the pathogens of concern. Quaternary ammonium compounds, peroxygen-based products, and iodine-based disinfectants are commonly used. Follow the manufacturer's instructions for concentration and contact time. Replace the footbath solution daily or more frequently if it becomes visibly dirty. The Merck Veterinary Manual (Management and Nutrition, [Merck Vet Manual](https://www.merckvetmanual.com/management-and-nutrition)) provides general guidance on disinfectant selection. ### Can I use the same equipment for quarantined animals and the main herd? No. Equipment used in the quarantine facility should not be shared with the main herd. If sharing is unavoidable, clean and disinfect the equipment thoroughly before and after use. Assign separate tools, such as pitchforks, buckets, and halters, to the quarantine facility. Color-coding equipment can help prevent accidental mixing. ### How often should I conduct a biosecurity audit? Conduct a biosecurity audit at least quarterly. More frequent audits may be necessary during disease outbreaks or after significant changes to the farm, such as new construction or the introduction of a large number of new animals. The audit should be conducted by the farm manager or an external consultant, and the results should be used to update the biosecurity plan. ### What should I do if a quarantined animal shows signs of disease? Isolate the animal immediately from other quarantined animals and consult a veterinarian. Do not release the animal from quarantine until the veterinarian has determined that it is safe to do so. Record the clinical signs, any treatments administered, and the veterinarian's recommendations. If the disease is notifiable, contact the relevant regulatory authority. ### How can I reduce the risk of disease introduction from wildlife? Wildlife, including birds, rodents, and deer, can introduce pathogens to the farm. Implement wildlife control measures, such as rodent-proof feed storage, bird netting over feed bunks, and fencing to exclude deer. Remove standing water and spilled feed that attract wildlife. The USDA Natural Resources Conservation Service ([NRCS](https://www.nrcs.usda.gov/)) provides technical guidance on wildlife management for agricultural operations. ### What records should I keep for biosecurity purposes? Maintain records of visitor logs, quarantine records, daily health observations, milk quality parameters, biosecurity audit results, and any diagnostic test results. Keep these records for at least one year and review them periodically to identify trends. The large-scale cross-sectional study of German dairy herds (Animals, 2024, [DOI](https://doi.org/10.3390/ani14091385)) underscores the value of systematic data collection for herd health management. ## Related Farming Guides - [Beef Herd Biosecurity Plan](/knowledge/animal-farming/beef-cattle/beef-herd-biosecurity-plan) - [Beef Cattle Quarantine Management](/knowledge/animal-farming/beef-cattle/beef-cattle-quarantine-management) - [Dairy Cattle Farming Nutrition Housing Health Signals And Herd Management](/knowledge/animal-farming/dairy-cattle/dairy-cattle-farming-nutrition-housing-health-signals-and-herd-management) - [Dairy Cow Cooling System Management](/knowledge/animal-farming/dairy-cattle/dairy-cow-cooling-system-management) - [Dairy Cow Culling Decisions And Records](/knowledge/animal-farming/dairy-cattle/dairy-cow-culling-decisions-and-records) ## Related Clinical & Scientific Guides * [Evaluating Feed Additives for Dairy Cow Performance](/knowledge/animal-farming/dairy-cattle/evaluating-feed-additives-for-dairy-cow-performance) * [Dairy Barn Fire Safety: Design and Prevention Measures](/knowledge/animal-farming/dairy-cattle/dairy-barn-fire-safety-design-prevention) * [Dairy Cow Pregnancy Loss Records and Review](/knowledge/animal-farming/dairy-cattle/dairy-cow-pregnancy-loss-records-and-review) ## References and Further Reading - [www.nrcs.usda.gov](https://www.nrcs.usda.gov/) - [www.merckvetmanual.com](https://www.merckvetmanual.com/management-and-nutrition) - [Application of an integrated outbreak management plan for the control of leptospirosis in dairy cattle herds.](https://pubmed.ncbi.nlm.nih.gov/23920354). Epidemiology and infection, 2014. - [Knowledge, attitudes, perceptions and practices of selected commercial dairy cattle farmers regarding neosporosis in South Africa.](https://pubmed.ncbi.nlm.nih.gov/41925591). The Onderstepoort journal of veterinary research, 2026. - [Managing a Salmonella Bredeney Outbreak on an Italian Dairy Farm.](https://pubmed.ncbi.nlm.nih.gov/39409724). Animals : an open access journal from MDPI, 2024. - [Use of scenario tree modelling to plan freedom from infection surveillance: Mycoplasma bovis in New Zealand.](https://pubmed.ncbi.nlm.nih.gov/34774335). Preventive veterinary medicine, 2022. - [The Gordon Memorial Lecture: A paradigm shift in high pathogenicity avian influenza and perspectives for the future.](https://pubmed.ncbi.nlm.nih.gov/42145115). British [poultry science](/knowledge/animal-farming/poultry/poultry-science-research-key-institutions-and-current-directions), 2026. - [Application of Epidemiological Methods in a Large-Scale Cross-Sectional Study in 765 German Dairy Herds-Lessons Learned](https://doi.org/10.3390/ani14091385). Animals, 2024. > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.