Does M smegmatis form spores?
Mycobacterium smegmatis has no motility and no formation of endospores (3, 13, 14).
Is Mycobacterium non spore forming?
Mycobacteria are slender, non spore-forming, rod-shaped, aerobic, slow-growing, and free-living in soil and water. These bacteria have a generation time of about 20 h, thus isolation and identification may take up to 6 weeks (although a few species may grow in only 5–7 days).
Where does Mycobacterium marinum come from?
Mycobacterium marinum (M. marinum) is a slow-growing atypical mycobacterium that is commonly found in bodies of fresh or saltwater in many parts of the world. Skin infections with Mycobacterium marinum in humans are relatively uncommon and are usually acquired from contact with contents of aquariums or fish.
What is Mycobacterium marinum infection?
Mycobacterium marinum is a non-tuberculous mycobacterium that causes a tuberculosis-like illness in fish and can infect humans when injured skin is exposed to a contaminated aqueous environment.
Do mycobacteria form spores?
A recent publication in PNAS reported that M. marinum and M. bovis bacillus Calmette-Guérin produce a type of spore known as an endospore, which had been observed only in the low G+C group of Gram-positive bacteria.
Which bacteria are spore forming?
Spore-forming bacteria include Bacillus (aerobic) and Clostridium (anaerobic) species. The spores of these species are dormant bodies that carry all the genetic material as is found in the vegetative form, but do not have an active metabolism.
Is Mycobacterium a spore forming?
The Mycobacterium genus is a member of the high G+C group of Gram-positive bacteria (Actinobacteria) for which there are no prior claims of endospore formation.
How common is Mycobacterium marinum in humans?
Frequency. M marinum infections are rare but well described in the literature. The estimated annual incidence is 0.27 cases per 100,000 adult patients. The infection is typically limited to the skin, mostly involving limbs, but spread to deeper structures has been reported.
How do you test for Mycobacterium marinum?
Polymerase chain reaction (PCR) amplification techniques using Mycobacterium genus-specific primers can be used to diagnose M marinum infection directly in the biopsy sample. Tuberculin skin test using purified protein derivative is positive in 67%-100% of cases.
Do mycobacteria have capsule?
Mycobacteria have an outer membrane. They possess capsules, and most do not form endospores.
Is Mycobacterium marinum a non-sporulating bacteria?
Sporulation has been demonstrated in a number of different bacteria but Mycobacteriumspp. have been considered to be non-sporulating bacteria. We recently provided evidence that Mycobacterium marinumand likely also Mycobacterium bovisbacillus Calmette–Guérin can form spores.
Can Mycobacterium Calmette–Guérin form spores?
We recently provided evidence that Mycobacterium marinumand likely also Mycobacterium bovisbacillus Calmette–Guérin can form spores. Mycobacterial spores were detected in old cultures and our findings suggest that sporulation might be an adaptation of lifestyle for mycobacteria under stress.
Is Mycobacterium marinum a good host for TB?
Interestingly it appears that mycobacteria have a growth advantage in water that contains disinfecting agents e.g. chlorine (Vaerewijck et al. 2005; Primm et al. 2004). Moreover, Mycobacterium marinumcauses a systemic TB-like infection and disease in ectothermic hosts e.g. fish and frogs.
Is sporulation an adaptation of lifestyle for mycobacteria under stress?
Mycobacterial spores were detected in old cultures and our findings suggest that sporulation might be an adaptation of lifestyle for mycobacteria under stress. Here we will discuss our current understanding of growth, cell division, and sporulation in mycobacteria.