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MicroBioNet Your Microbiology Universe on the Internet |
| BACTERIOLOGY |
| P.Niger |
| CLASSIFICATION | VIRULENCE FACTORS | ENVIRONMENTAL |
| BIOCHEMISTRY | NORMAL FLORA | INDUSTRIAL USES |
| GENETICS | PATHOGENS | VACCINES |
| SEROLOGY | LABORATORY ID |
P. niger is the only species currently accepted in this genus, most of the other species were transferred to the Peptostreptococcus genus and some to Staphylococcus or Streptococcus. It is found as nonmotile diplococci, irregular clumps or regular clusters. P. niger is characterised by having alanine in position 1 and lysine in position 3 of its peptidoglycan molecule. The GC content of the DNA is 50-51 mol%.
P. niger produces n- capronate and butyrate from glucose but not isocaproate. Succinate is not formed from fumarate and neither is propionate from lactate. Gas is only produced weekly from glucose, and the organisms are indole, nitrate, urease and catalase negative. They do not produce acid from glucose, lactose, maltose, mannose or sucrose.
No information available.
No information available.
Have not been studied.
Like most Gram-positive cocci, P. niger are often isolated from human skin. They also form part of the normal flora of the alimentary tract and vagina of humans and animals.
Intestinal Infections:
P. niger is not generally associated with intestinal infections.
Extraintestinal Infections:
P. niger is associated with wound infections, particularly those wounds where a foul smelling pus is noted.These organisms may also be associated with other organisms such as Bacteroides to cause mixed soft-tissue infections.
Animal Infections:
Similar infections to those found in humans may occur.
Anaerobic culture methods have to be strictly adhered to and complex media are required. Media such as blood agar or chopped meat media or similarly protein rich media are required. Prereduced Peptone-Yeast extract (PY) medium is most commonly used for characterising anaerobic cocci.
Not normally found in soil or water.
None.
None developed.
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GRAM POSITIVE |
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(Including Acid-Fast) |
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FAMILIES
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| Bacillaceae |
| Micrococcaceae |
| Mycobacteriaceae |
| Peptococcaceae |
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