DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of Prevotella intermedia, Gram-negative, anaerobic, rod shaped, prokaryote (bacterium). Prevotella intermedia is a black pigmented bacterium that was formerly known as Bacteroides intermedius or Bacteroides melaninogenicus. It can coaggregate with other Gram-positive oral bacteria such as Porphyromonas gingivalis and Actinomyces viscosus. P. intermedia is a normal part of the oral and vaginal flora but can cause respiratory infections including aspiration pneumonia, lung abscesses and osteomyelitis. It can also cause gingivitis and other types of oral lesions including vertical bone loss. P. intermedia, along with Porphyromonas gingivalis, are known to cause polymicrobial infections. Prevotella sp. often become resistant to antibiotics, especially tetracycline and penicillin. Magnification: x3,400 when shortest axis printed at 25 millimetres.
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