Swine tuberculosis is one of the potential hazards in livestock farming, but it does not show clear symptoms, leading to carcasses being rejected during inspection. Let Vemedim help you learn an overview of the disease mechanism, recognizable signs, and effective prevention solutions so farmers can be more proactive in livestock management.
Overview of swine tuberculosis
Tuberculosis in pigs is a chronic bacterial infection caused by bacteria belonging to the Mycobacterium group, most commonly the Mycobacterium avium complex (M. avium complex). Today, swine tuberculosis is rare, but it causes significant economic losses for farmers.
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Causes of swine tuberculosis
Tuberculosis in pigs is caused by strains of Mycobacterium spp., which can survive for a long time in the environment and resist many unfavorable conditions. The bacteria grow slowly and persist in soil, water, manure, and contaminated bedding.
Causative agents
- Mycobacterium avium complex (MAC): most commonly found in pigs, originating from birds or contaminated environments.
- Mycobacterium bovis and Mycobacterium tuberculosis (cattle and human strains) are rare in pigs but can be transmitted through contact with infected livestock or people.
Sources of infection and favorable conditions
- Feed, drinking water, or bedding contaminated with droppings from wild birds, especially birds carrying avian tuberculosis pathogens.
- Fields previously fertilized with chicken manure or frequented by infected livestock, badgers, or wild birds.
- Natural water sources or ponds contaminated with M. avium, where the bacteria can survive for a long time.
Clinical signs of swine tuberculosis
After entering the body through the digestive tract (feed, drinking water), Mycobacterium bacteria settle in the lymph nodes of the neck, throat, or mesentery. There, they trigger a chronic inflammatory response, forming characteristic tuberculous nodules (granulomatous lesions).
These nodules develop slowly, are painless, and do not affect the pig’s overall health. The disease usually does not spread widely, except in cases where pigs are immunocompromised or poorly nourished; in such cases, the bacteria may spread to other organs. The disease is only detected during necropsy or post-slaughter inspection, when small, off-white or pale yellow nodules are found in the cervical and mesenteric lymph nodes.
Because the disease progresses silently, diagnosis in live pigs is very difficult.
- In some places, a tuberculin skin test may be used to check the immune response, but it is rarely applied in pig farming.
- Usually, the disease is only discovered through slaughterhouse inspection results, when carcass condemnation rates increase or tuberculous lesions are recorded.
- Laboratory tests (Ziehl-Neelsen staining, culture, or PCR) can be used to identify the Mycobacterium species causing the disease.
Control and prevention of swine tuberculosis
Because tuberculosis in pigs cannot be effectively treated with antibiotics and there is no preventive vaccine, the most important measure is to control sources of infection and the living environment. Below are the measures farmers should apply:
Housing hygiene management
- Keep the barn clean, dry, and well-ventilated.
- Periodically disinfect the housing area with Vemedim Altacid solution to eliminate bacteria in the environment.
- Remove bedding, soil, and dirty manure suspected of carrying pathogens.
Source control
- Prevent wild birds, domestic birds, rats, or other animals from accessing pigs’ feed and drinking water.
- Do not use chicken manure or poultry manure as fertilizer on pig pastures for at least one year.
- Treat water sources appropriately with Vemedim Disina to prevent M. avium contamination.
Monitoring and regular inspection
- Monitor slaughterhouse reports on carcass condemnation rates to detect early signs of disease in the herd.
- Conduct regular biosecurity and hygiene inspections, especially in feed and water storage areas.
- When a positive case is detected, inject Vemedim Kanamycin 20% - a specific treatment for pulmonary tuberculosis in pigs. Administer intramuscularly or subcutaneously (1 ml/20 kg body weight), once daily for 3-5 days.
- If the case is not favorable, infected animals should be culled and the entire farm should be cleaned and disinfected.
The disease is not transmitted between individual pigs, but it causes economic losses due to carcass condemnation at slaughterhouses. Therefore, farmers need to focus on environmental hygiene, water management, preventing wildlife access, and complying with biosecurity procedures in livestock production.
Effective control of swine tuberculosis requires a combination of strict monitoring of breeding stock origins, barn environment, waste treatment, and quarantine before pigs are sent to slaughter. When farmers strictly manage these steps, cooperate with veterinary specialists, and apply appropriate treatment and supportive measures, losses can be minimized and the herd can grow healthily. If you need further support in caring for your pig herd, please contact Vemedim for more advice and assistance!
