What are some species of bacteria that are non-pathogenic and gram-negative, along with literature validation that they are non-pathogenic and gram-negative
If you mean pathogenic to humans and non-opportunistic pathogens, there are several examples. Commensal GN bacteria (e.g. E. coli, B. vulgatus) are considered non-pathogenic. Moreover, some species belonging to the Psychrobacter (e.g. celer), Halomonas, Chryseobacterium and Zymomonas genera have not been described to be pathogenic.
"Nonpathogenic" is an absolute. In a global infective context that includes immunocompromised hosts, it's difficult to justify that any microbe is totally without pathogenicity - has never and can never (never is a long time) serve as etiologic agent of infection/intoxication. Numerous reports of infection with members of normal flora, such as E. coli and Bacteroides spp .(incl vulgatus), are in the literature as well as a few for microbes seemingly remote from infective potential
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You might read a conceptual approach to the question http://iai.asm.org/content/68/12/6511.short
Dear Sen,
All gram negative bacteria of Enterobacteriacea which live in GIT (Gastro-Intestinal Tract) are considered normal flora and non-pathogenic unless some opportunistic conditions makes them pathogenic. It is also called Colon bacteria.
Best and kind regard
Gram-negative bacteria In a Gram stain test, a counterstain commonly safranin is added after the crystal violet, coloring all Gram-negative bacteria with a red or pink color. The test itself is useful in classifying two distinct types of bacteria based on the structural differences of theircell wall . On the other hand, The pathogenic capability of Gram-negative bacteria is often associated with certain components of Gram-negative cell walls, in particular the lipopolysacchride also known as LPS orendotoxins.
Yes, there are, some strain of E.coli and Zymomonas have been reported to be not pathogenic.
Many bacterial Gran negative species are non-pathogenic such as many colon bacteria: Zymomonas mobilis , Citrobacter , Enterobacter , P.freundi and some E.coli strains.Many of them are colon inhabitants and in immunocompromised cases can be changed from safe to be opportunistic pathogens.
Yes, Neisseria lactamica is an example of non-pathogenic Gram negative bacterium.
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