Mycobacterium agri is a species of the phylum actinobacteria (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus mycobacterium.

Description

Microscopy

• Gram-positive, nonmotile and acid-fast rods (3-7 µm long). Frequently join to grow in long threads.

Colony characteristics

• Rough, and nonphotochromogenic colonies.

Physiology

• Rapid growth on egg media at 22-45°C, not at 52°C, in less than 5 days.
• Niacin negative, catalase positive, β-galactosidase usually positive.
• Tween 80 not hydrolysed after 14 days.
• Resistant to 5% NaCl, p-nitrobenzoic acid (0.5 mg/ml) and thiophene-2-carboxylic acid hydrazide (1 mg/l).

Pathogenesis

Not associated with disease.

Distribution

• Found in soil world-wide

Type strain

• Strain 90012 = ATCC 27406 = CCUG 37673 A = CIP 105391 = DSM 44515 = JCM 6377.

References

• Tsukamura,M. 1981. Numerical analysis of rapidly growing, nonphotochromogenic mycobacteria, including Mycobacterium agri (Tsukamura 1972) Tsukamura sp. nov., nom. rev. Int. J. Syst. Bacteriol. 31, 247-258.

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