a genus of gram-positive, aerobic, acid-fast bacteria, occurring as slightly curved or straight rods. It contains many species, including the highly pathogenic organisms that cause tuberculosis
) and leprosy
). M. a´vium
causes tuberculosis in birds and pigs and pulmonary disease in humans. M. bo´vis
is the bovine tubercle bacillus and can cause tuberculosis in humans who drink infected milk (strict testing of cattle makes this uncommon in developed countries); an attenuated strain is used to prepare BCG vaccine
. M. chelo´nae
is an opportunistic pathogen that causes synovial lesions, gluteal abscesses, and gross lesions in various organs. M. fortu´itum
causes lesions of the lung, bone, or soft tissue following trauma. M. haemo´philum
causes skin lesions. M. ho´minis
is a common inhabitant of the vagina and cervix and causes infections of the male and female reproductive tracts, as well as respiratory disease and pharyngitis. M. intracellula´re
occasionally causes chronic pulmonary disease in adults and lymph node infection in children. M. kansa´sii
causes a tuberculosis-like disease. M. mari´num
(also known as M. bal´nei
) is the agent of swimming pool granuloma
mycobacterium [mi″ko-bak-tē″re-um] (L.)
1. an individual organism of the genus Mycobacterium.
2. a slender, acid-fast microorganism resembling the bacillus that causes tuberculosis.
nontuberculous mycobacteria mycobacteria other than M. tuberculosis or M. bovis, consisting of nonpathogens and pathogens causing opportunistic infections in immunocompromised patients and infections in otherwise normal individuals.
A genus of aerobic, nonmotile bacteria (family Mycobacteriaceae) containing gram-positive, acid-fast, slender, straight or slightly curved rods; slender filaments occasionally occur, but branched forms rarely are produced. Parasitic and saprophytic species occur. Several of species are associated with infections in immunocompromised people, especially those with AIDS. The type species is Mycobacterium tuberculosis. It is the type genus of the family Mycobacteriaceae.
[myco- + bacterium]
A genus of aerobic, nonmotile bacteria (family Mycobacteriaceae) containing gram-positive, acid-fast, slender, straight or slightly curved rods; slender filaments occasionally occur, but branched forms rarely are produced. Parasitic and saprophytic species occur. Some species are associated with infections in immunocompromised people, especially those with AIDS. The type species is M. tuberculosis. It is the type genus of the family Mycobacteriaceae.
[myco- + bacterium]
Mycobacterium (mi?ko-bak-tir'e-um) [ myco- + bacterium]
A genus of acid-fast, nonmotile, non–spore-forming bacilli of the family Mycobacteriaceae, which includes the causative agents of tuberculosis and leprosy. The organisms are slender, nonmotile, gram-positive rods and do not produce spores or capsules.
Species include M. africanum, M. avium intracellulare, M. bovis, M. chelonei, M. fortuitum, M. gastri, M. gordonae, M. kansasii, M. marinum, M. scrofulaceum, M. terrae, M. triviale, M. smegmatis, and M. xenopi.
The causative species of tuberculosis in cows and, less commonly, in humans.
A causative species of tuberculosis-like pulmonary disease in humans.
The causative species of leprosy.
An atypical mycobacterium that thrives in water and produces skin infection resembling sporotrichosis. It is the cause of swimming pool granuloma.
nontuberculous Mycobacterium Abbreviation: NTM
Any mycobacterium that does not cause tuberculosis. There are four main classes. Three of these groups grow more slowly than M. tuberculosis and one group grows more rapidly. These organisms may cause various skin, lung, or other conditions or they may be harmless.
An emerging but still uncommon acid-fast bacillus that grows slowly. It differs from M. avium in having distinct mycolic acids and ribosomal RNA.
MYCOBACTERIUM TUBERCULOSIS: Acid-fast bacillus in sputum (orig. mag. ×500)
The causative agent of tuberculosis in humans. See: tuberculosis
A causative agent of infections of the skin and the underlying soft tissues. It is a common cause of illness in tropical and subtropical Africa and South America, where it is responsible for Buruli ulcer. It is thought to be the third most common disease-causing mycobacterium (after M. tuberculosis and M. leprae) in humans.
the only genus in the family Mycobacteriaceae of bacteria; slender acid-fast rods which may be straight or slightly curved. They may produce filaments or cocci. The most serious disease caused by members of this genus is tuberculosis
. M. fortuitum
, M. chelonea
, M. marinum
are listed as causes of piscine tuberculosis. Other species, including M. aquae
, M. kansasii
and M. scrofulaceum
, may occasionally cause disease in a number of different species.
found mostly in birds but occasionally also in other animals and in humans. The tubercle bacillus of birds, it causes avian tuberculosis
Mycobacterium avium subsp. paratuberculosis
causes Johne's disease in cattle, sheep, goats, deer and camelids. Previously called M. johnei and M. paratuberculosis.
complex see M. intracellulare (below).
the tubercle bacillus of the bovine, it causes tuberculosis
in many animal species and humans.
Mycobacterium chelonei, Mycobacterium fortuitum, Mycobacterium phlei, Mycobacterium smegmatis, Mycobacterium thermoresistible
cause disease in a number of animal species, including mastitis in cattle and cutaneous mycobacterial
granuloma in cats and dogs. See also opportunist (atypical) mycobacteria
Mycobacterium farcinogenes, Mycobacterium senegalense Mycobacterium genovense
causes mycobacteriosis in birds.
found in tuberculin-positive cattle and causes limited lymph node lesions in pigs. Closely related to M. avium and also described as M. avium-intracellulare complex.
see M. avium subsp. paratuberculosis (above).
causes tuberculosis-like disease in pigs, deer and cattle.
the cause of leprosy in humans.
causes murine and feline
found in water, it causes tuberculosis in fish and skin ulcers in humans.
the vole bacillus; lesions sometimes occur in other species.
previously called M. johnei. See M. avium subsp. paratuberculosis (above).
the tubercle bacillus of humans, but found also in monkeys and pigs, and rarely in cattle, dogs and parrots.
causes skin ulcers in humans and cats.
granuloma in cats and lymph node lesions in pigs.