Glanders in Horses and Other Animals - Generalized Conditions - MSD Veterinary Manual (2024)

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Glanders in Horses and Other Animals - Generalized Conditions - MSD Veterinary Manual (1)

Professional Version

(Farcy)

By

John F. Timoney

, MVB, PhD, Department of Veterinary Science, College of Agriculture, Food and Environment, University of Kentucky

Reviewed/Revised Aug 2020 | Modified Oct 2022

  • Etiology
  • Clinical Findings
  • Diagnosis
  • Prevention and Treatment
  • Key Points
  • For More Information

Glanders, an often fatal contagious disease of solipeds, now found in remote areas of the world, is caused by Burkholderia mallei. The disease is characterized by purulent nasal discharge, nasal mucosal ulceration, lung lesions, and ulcerating nodules along the subcutaneous lymphatics. Diagnosis is based on presence of nasal ulcers, complement fixation test reaction, positive mallein test, and culture and PCR. Control is based on isolation and culling of affected animals.

Glanders is a contagious, acute or chronic, usually fatal disease of Equidae caused by Burkholderia mallei, a pathoadaptive clone derived from B pseudomallei. It is characterized by serial development of nodules in the upper respiratory tract, lungs, and skin. Felidae and other species are susceptible, and infections are usually fatal. The organism is infectious for people, with a 95% fatality rate in untreated septicemia cases, and is therefore considered a potential bioterrorism agent. Glanders is one of the oldest diseases known and once was prevalent worldwide. It has now been eradicated or effectively controlled in many countries, including the USA. In recent years, the disease has been reported in the Middle East, Pakistan, India, Mongolia, China, South America, Africa, and some European countries, including Russia.

Etiology of Glanders in Horses and Other Animals

Burkholderia mallei, a clonal gram-negative facultative intracellular obligate pathogen, is present in nasal exudates and discharges from ulcerated skin. Glanders is commonly contracted by:

  • ingesting food or water contaminated with nasal discharges of carrier animals

  • contact with harness components

  • ingestion of meat from affected horses

The organism is susceptible to heat, light, and disinfectants; survival in a contaminated area is limited to 1–2 months. Humid, wet conditions favor survival. A polysaccharide capsule is an important virulence factor and enhances survival in the environment.

Clinical Findings of Glanders in Horses and Other Animals

After an incubation period of 3 days to 2 weeks, animals acutely affected by glanders usually have:

  • septicemia

  • high fever (as high as 106°F [41°C])

  • weight loss

  • a thick, mucopurulent, yellowish nasal discharge

  • respiratory signs

Death occurs within a few days. The chronic disease is common in horses and is seen as a debilitating condition with nodular or ulcerative lesions of the skin and internal nares. Infected animals may live for years and continue to disseminate the organism. In some, the infection may be latent and persist for long periods. Donkeys and mules are more severely affected than horses.

Nasal, pulmonary, and cutaneous forms of glanders are recognized, and an animal may be affected by more than one form at a time. In the nasal form of glanders, nodules develop in the mucosa of the nasal septum and lower parts of the turbinates. The nodules degenerate into deep ulcers with raised irregular borders. Characteristic star-shaped cicatrices remain after the ulcers heal. In the early stage, the submaxillary lymph nodes are enlarged and edematous and later become adherent to the skin or deeper tissues.

In the pulmonary form of glanders, small, tubercle-like nodules, which have caseous or calcified centers surrounded by inflammatory zones, are found in the lungs. If the disease process is extensive, consolidation of the lung tissue and pneumonia may be present. The nodules tend to break down and may discharge their contents into the bronchioles, resulting in extension of the infection to the upper respiratory tract.

In the cutaneous form of glanders (“farcy”), nodules appear along the course of the lymph vessels, particularly of the extremities. These nodules degenerate and form ulcers that discharge a highly infectious, sticky pus. The liver and spleen also may show typical nodular lesions. Histologically, there may be vasculitis, thrombosis Thrombosis, Embolism, and Aneurysm in Animals Thrombosis (clot formation within a blood vessel), embolism (process by which unattached material (emboli) such as a blood clot, fat or cholesterol deposit, gas, tissue, or foreign material... read more , and infiltration of degenerating inflammatory cells.

Diagnosis of Glanders in Horses and Other Animals

  • Suspected based on cutaneous nodules exuding honey-like discharge or nasal discharge with ulcers on nasal mucosa

  • Confirmed by complement fixation test, culture, and PCR

The typical nodules, ulcers, scar formation, and debilitated condition may provide sufficient evidence for a clinical diagnosis of glanders. However, because these signs usually do not develop until the disease is well advanced, specific diagnostic tests should be used as early as possible. Culture of B mallei from lesions confirms the diagnosis. A test for delayed hypersensitivity is performed by intrapalpebral inoculation of mallein, a secreted glycoprotein of B mallei found in culture supernatant. Infected hypersensitive horses develop a purulent conjunctivitis within 24 hours and swelling of the eyelid. Complement fixation is also used to screen for infection. Competitive ELISA is more sensitive than complement fixation and may become positive as early as 3 days after infection. PCR based on 16S and 23S rRNA gene sequences may be used for specific identification.

Prevention and Treatment of Glanders in Horses and Other Animals

  • Detection and elimination of confirmed cases

  • Treatment is contraindicated

There is no vaccine for glanders. Protective immunity involves T cell responses elicited by live attenuated bacteria. Prevention and control of glanders depend on early detection and elimination of affected animals, as well as complete quarantine and rigorous disinfection of the area involved. Successful control is dependent on efforts to establish awareness among horse and donkey owners in remote areas, in addition to provision of funds to cull affected animals. Treatment of glanders does not reliably produce a bacteriologic cure. Doxycycline, ceftrazidime, gentamicin, streptomycin, and combinations of sulfazine or sulfamonomethoxine with trimethoprim were effective in the prevention and treatment of experimental glanders.

Key Points

  • Glanders, an often fatal contagious disease of horses and other equids, is caused by Burkholderia mallei.

  • Control depends on detection, isolation, and culling of affected animals.

  • Treatment may not eliminate infection and is contraindicated.

For More Information

  • Also see pet health content regarding glanders in cats Glanders (Farcy) in Cats Glanders is a contagious, short- or longterm, usually fatal disease of horses caused by the bacterium Burkholderia mallei. The disease is characterized by the development of a series... read more , dogs Glanders (Farcy) in Dogs Glanders is a contagious, short or longterm, usually fatal disease of horses caused by the bacterium Burkholderia mallei. The disease is characterized by the development of a series of... read more , and horses Glanders (Farcy) in Horses Glanders is a contagious, short- or longterm, usually fatal disease of the horse family caused by the bacterium Burkholderia mallei. The disease is characterized by the development of... read more .

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Glanders in Horses and Other Animals - Generalized Conditions - MSD Veterinary Manual (2024)

FAQs

What is glanders disease MSD? ›

Glanders is a contagious, short- or longterm, usually fatal disease of the horse family caused by the bacterium Burkholderia mallei. The disease is characterized by the development of ulcerating growths that are most commonly found in the upper respiratory tract, lungs, and skin.

What are the clinical signs of glanders in horses? ›

Clinical signs for the chronic form of glanders in horses include intermittent fever, cough, weight loss, yellow-green nasal discharge, and a bloody nose. Joint swelling in the hindquarters can lead to lameness.

What animals are affected by glanders? ›

Glanders is an infectious and life-threatening disease that mainly affects horses, donkeys or mules caused by the bacterium Burkholderia mallei. Glanders can be transmitted to humans. Susceptibility to glanders has also been demonstrated in camels, felines living in the wild, bears, wolves and dogs.

What is a differential diagnosis of glanders in horses? ›

Differential diagnosis with other infections as strangles, ulcerative lymphangitis, botryomycosis, sporotrichosis, pseudotuberculosis, epizootic lymphangitis, horsepox, tuberculosis and other pathologies like trauma an allergy.

What are the symptoms of glanders in animals? ›

Glanders may present as an acute, chronic, or latent infection. Symptoms of acute illness include fever, weight loss, cough, and nasal discharge, which typically is thick and yellowish white. The disease progresses rapidly; death may occur within several days, owing to respiratory failure or septicemia.

What is the cause of glanders in horses? ›

Glanders is an infectious disease that is caused by the bacterium Burkholderia mallei. While people can get the disease, glanders is primarily a disease affecting horses. It also affects donkeys and mules and can be naturally contracted by other mammals such as goats, dogs, and cats.

What is the cure for glanders? ›

All patients with glanders will need to be treated with the appropriate antibiotic treatment regimen. Treatment consists of two rounds: an intravenous round and an oral eradication round. The first round of treatment usually lasts 10 to 14 days, but may last longer for patients with more severe disease.

Is glanders fatal in horses? ›

Glanders, an often fatal contagious disease of horses and other equids, is caused by Burkholderia mallei. Control depends on detection, isolation, and culling of affected animals. Treatment may not eliminate infection and is contraindicated.

How does glanders affect the body? ›

Common symptoms of glanders include fever with chills and sweating, muscle aches, chest pain, muscle tightness, and headache. Additional symptoms may include excessive tearing of the eyes, light sensitivity, ulcers, and diarrhea (loose stool/poop). Symptoms can develop 1 to 5 days after infection.

How is glanders diagnosed? ›

Glanders can be diagnosed by culturing B. mallei from lesions, as in animals. This organism may also be found in sputum, blood or urine, although blood cultures are often negative. PCR assays or antigen detection tests could be useful, though they are not employed routinely.

How do you prevent glanders in horses? ›

There is no vaccine for glanders. Protective immunity involves T cell responses elicited by live attenuated bacteria. Prevention and control of glanders depend on early detection and elimination of affected animals, as well as complete quarantine and rigorous disinfection of the area involved.

Are glanders and strangles the same? ›

Glanders should not be confused with strangles. The latter is caused by the bacterium Streptococcus equi and occurs – by contrast with glanders – frequently in horses in the Netherlands.

What is the gold standard test for glanders? ›

Bacterial isolation and identifying B. mallei from skin lesions and nasal exudates are considered the gold standard for diagnosing glanders (Elschner et al.

What is the prognosis for glanders? ›

Most cases of glanders do not result in death unless the infection spreads to the bloodstream. In those cases, the person will usually die within seven to 10 days. It is unknown how deadly the other forms of glanders are because there have been no cases in the United States since 1945.

What is the common name for glanders? ›

The chronic, cutaneous form of glanders presents as ulcerated skin lesions along major lymph and blood vessels and is known as farcy (from the Latin farcire, “sausage”).

What are the symptoms of glanders in humans? ›

Common symptoms of glanders include fever with chills and sweating, muscle aches, chest pain, muscle tightness, and headache. Additional symptoms may include excessive tearing of the eyes, light sensitivity, ulcers, and diarrhea (loose stool/poop). Symptoms can develop 1 to 5 days after infection.

Is glanders fatal to humans? ›

Glanders can be a serious disease. Without treatment with specific antibiotics, as many as 9 of every 10 people who get it die. When people with glanders get treatment with the correct antibiotics, up to 5 of 10 people die.

How do humans get glanders? ›

The bacteria that cause glanders are transmitted to humans through contact with tissues or body fluids of infected animals. The bacteria enter the body through cuts or abrasions in the skin and through mucosal surfaces such as the eyes and nose.

What is glanders and how was it used in warfare? ›

Glanders is a disease that primarily affects horses, mules, and donkeys. In World War I, German forces reportedly spread glanders to debilitate enemy cavalries. But the bacteria that causes glanders, Burkholderia mallei, can also infect humans.

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