''Mycobacterium gastri'' is a species of the phylum

Actinomycetota The ''Actinomycetota'' (or ''Actinobacteria'') are a phylum of all gram-positive bacteria. They can be terrestrial or aquatic. They are of great economic importance to humans because agriculture and forests depend on their contributions to s ...

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Gram-positive In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall. Gram-positive bact ...

bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of prokaryotic microorganisms. Typically a few micrometr ...

with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus '' Mycobacterium''.

Description

Moderately long to long, Gram-positive, aerobic, nonmotile and acid-fast rods. Colony characteristics *Nonchromogenic, smooth to rough, white colonies on Löwenstein-Jensen medium and smooth or somewhat granular on Middlebrook 7H10 agar. Physiology *Growth on Löwenstein-Jensen medium or on Middlebrook 7H10 agar at 37 °C, (temperature range 25 °C-40 °C), within 7 or more days. *Does not grow in the presence of

ethambutol Ethambutol (EMB, E) is a medication primarily used to treat tuberculosis. It is usually given in combination with other tuberculosis medications, such as isoniazid, rifampicin and pyrazinamide. It may also be used to treat ''Mycobacterium avi ...

isoniazid Isoniazid, also known as isonicotinic acid hydrazide (INH), is an antibiotic used for the treatment of tuberculosis. For active tuberculosis it is often used together with rifampicin, pyrazinamide, and either streptomycin or ethambutol. For la ...

. Differential characteristics *Closely related to '' M. kansasii'' * M. gastri and '' M. kansasii'' share an identical 16S rDNA sequence. Species differentiation is possible by differences in the ITS and hsp65 sequences. *'' M. kansasii'' produces a

photochromogenic The Timpe and Runyon classification of nontuberculous mycobacteria based on the rate of growth, production of yellow pigment and whether this pigment was produced in the dark or only after exposure to light. It was introduced by Ernest Runyon in ...

yellow pigment. *AccuProbes for '' M. kansasii'' are negative.

Pathogenesis

*Casual resident of human stomachs, but not considered a cause of disease. * Biosafety level 1

Type strain

*First isolated from human gastric specimen. Also found in soil. Strain ATCC 15754 = CCUG 20995 = CIP 104530 = DSM 43505 = JCM 12407.

References

*Wayne, L. 1966. Classification and identification of mycobacteria. III. Species within Group III. American Review of Respiratory Diseases, 93, 919–928.]

External links

Type strain of ''Mycobacterium gastri'' at Bac''Dive'' - the Bacterial Diversity Metadatabase
Acid-fast bacilli gastri Bacteria described in 1966 {{Mycobacterium-stub