El muermo es una enfermedad infecciosa, producida por la bacteria Burkholderia mallei (antes Pseudomonas mallei). Es una infección típica de equinos (caballos, asnos y mulas), aunque también afecta ovejas, cabras, perros y gatos. Ocasionalmente se contagia a los humanos y debe ser considerada una zoonosis. La enfermedad en humanos incluye: neumonía; necrosis de la piel y las mucosas y un cuadro linfoide (agudo o crónico) con nódulos diseminados. Puede ocurrir una infección sistémica y septicemia.

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Glanders (from Middle English glaundres or Old French glandres, both meaning glands; Latin: malleus, German: Rotz; also known as "equinia", "farcy", and "malleus") is an infectious disease that occurs primarily in horses, mules, and donkeys. It can be contracted by other animals, such as dogs, cats, goats and humans. It is caused by infection with the bacterium Burkholderia mallei, usually by ingestion of contaminated feed or water. Signs of glanders include the formation of nodular lesions in the lungs and ulceration of the mucous membranes in the upper respiratory tract. The acute form results in coughing, fever, and the release of an infectious nasal discharge, followed by septicaemia and death within days. In the chronic form, nasal and subcutaneous nodules develop, eventually ulcerating. Death can occur within months, while survivors act as carriers. Glanders is endemic in Africa, Asia, the Middle East, and Central and South America. It has been eradicated from North America, Australia, and most of Europe through surveillance and destruction of affected animals, and import restrictions. B. mallei is able to infect humans, so is classed as a zoonotic agent. Transmission occurs by direct contact with infected animals and entry is through skin abrasions, nasal and oral mucosal surfaces, or by inhalation. The mallein test is a sensitive and specific clinical test for glanders. Mallein (ATCvet code: QI05AR01 (WHO)), a protein fraction of the glanders organism (B. mallei), is injected intradermopalpebrally or given by eye drop. In infected animals, the eyelid swells markedly in 1 to 2 days. Glanders has not been reported in the United States since 1945, except in 2000 when an American lab researcher suffered from accidental exposure. It is a notifiable disease in the UK, although it has not been reported there since 1928.

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