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Chapter 51 : , and Other Anaerobic Gram-Negative Rods

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Abstract:

Within the family , the genus consists of saccharolytic, bile-resistant, and nonpigmented species, mainly isolated from the gut. In a study using sequencing of the 16S-23S rRNA gene internal transcribed spacer regions of species, three phylogenetic clusters were formed. Many anaerobic gram-negative rods, e.g., different species within the genus , have unique cell morphology. Molecular methods are increasingly used for direct detection of bacteria from clinical specimens. The pigmented and species vary greatly in the degree and rapidity of pigment production (2 to 21 days), which ranges from buff to tan to black, depending primarily on the type of blood and the composition of the base medium used in the agar. Fluorescence under long-wavelength UV light can be helpful in presumptive identification; pigmented Prevotella and Porphyromonas colonies typically fluoresce red, and fluoresce yellow-green, and Desulfovibrio and Bilophila species, when tested with a drop of NaOH on a swab of cell paste, fluoresce red due to the presence of desulfoviridin pigment. In a survey, conducted at the National Taiwan University Hospital, the proportion of susceptible isolates of , , and/or species to many antimicrobials, especially cefmetazole, clindamycin, and the combination ampicillin-sulbactam, decreased during the period from 2000 to 2007.

Citation: Könönen E, Wade W, Citron D. 2011. , and Other Anaerobic Gram-Negative Rods, p 858-880. In Versalovic J, Carroll K, Funke G, Jorgensen J, Landry M, Warnock D (ed), Manual of Clinical Microbiology, 10th Edition. ASM Press, Washington, DC. doi: 10.1128/9781555816728.ch51

Key Concept Ranking

Gram-Negative Bacilli
0.6875306
Gram-Negative Cocci
0.6855549
Gram-Negative Coccobacilli
0.6855549
Gram-Negative Bacteria
0.61270195
Necrotizing Ulcerative Gingivitis
0.45286003
16s rRNA Sequencing
0.4394619
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