Prevotella is a genus of bacteria.

Bacteroides melaninogenicus
Bacteroides melaninogenicus
Bacteroides melaninogenicus is a normal flora found in the upper respiratory tract. it is an important human pathogen in various anaerobic infections often mixed with other aerobic and anaerobic bacteria....

has recently been reclassified and split into Prevotella melaninogenica and Prevotella intermedia
Prevotella intermedia
Prevotella intermedia is a gram-negative obligate anaerobic pathogen involved in periodontal infections, including gingivitis and periodontitis, and often found in Acute necrotizing ulcerative gingivitis . It is commonly isolated from Dentoalveolar abscesses, where obligate anaerobes...


Prevotella spp. are members of the oral and vaginal flora and are recovered from anaerobic infection
Anaerobic infection
Anaerobic infections are caused by anaerobic bacteria. Anaerobic bacteria do not grow on solid media in room air ; facultative anaerobic bacteria can grow in the presence as well as in the absence of air. Microaerophilic bacteria do not grow at all aerobically or grow poorly, but grow better under...

s of the respiratory tract. These infections include aspiration pneumonia, lung abscess, pulmonary empyema, and chronic otitis media and sinusitis. They have been isolated from abscesses and burns in the vicinity of the mouth, bites, paronychia
The nail disease paronychia , commonly misidentified as a synonym for whitlow or felon, is an often-tender bacterial or fungal hand infection or foot infection where the nail and skin meet at the side or the base of a finger or toenail...

, urinary tract infection
Urinary tract infection
A urinary tract infection is a bacterial infection that affects any part of the urinary tract. Symptoms include frequent feeling and/or need to urinate, pain during urination, and cloudy urine. The main causal agent is Escherichia coli...

, brain abscess
Brain abscess
Brain abscess is an abscess caused by inflammation and collection of infected material, coming from local or remote infectious sources, within the brain tissue...

es, osteomyelitis
Osteomyelitis simply means an infection of the bone or bone marrow...

 and bacteremia
Bacteremia is the presence of bacteria in the blood. The blood is normally a sterile environment, so the detection of bacteria in the blood is always abnormal....

associated with upper respiratory tract infections. Prevotella spp. predominate in periodontal disease and periodontal abscess.
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