Chapter 15 : The Genus Morganella

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In 1906, Morgan described a group of bacteria that were associated with cases of infantile gastroenteritis that we now recognize as belonging to the genus . Only recently have phylogenetic trees based upon 16S rRNA gene sequences been published which include the genus . As expected, 16S rRNA sequence data indicate that, regardless of method employed (neighbor joining or parsimony), the genus clusters with other taxa traditionally associated with the tribe Proteeae, including and . Several biochemical properties are uniquely associated with the genus and related tribe members or are rarely encountered in other genera within the . Various serologic schemes for have been proposed based upon the presence of somatic (O), flagellar (H), and capsular antigens. strains produce very few extracellular enzymatic activities. Of these, elaboration of a beta-hemolysin is probably the most attractive candidate at present as a reputed virulence factor. Ureases promote the alkalinization of urine, leading to crystal formation and encrustation. This subsequently develops into catheter-associated obstructions. strains multiply quicker and produce alkaline conditions faster in urine than does .

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15

Key Concept Ranking

Gram-Negative Bacilli
Traveler's Diarrhea
Outer Membrane Proteins
Morganella morganii
16s rRNA Sequencing
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Figure 1

Colonial dissociants of on salmonella-shigella agar.

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15
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Figure 2

Susceptibility of isolates to tetracycline, as determined by AB Biodisk E test (Remel, Lenexa, Kans.). Tetracycline susceptibility is linked to biogroups (C, E, and F) and subspecies (a majority of subsp. isolates are tetracycline resistant).

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15
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Table 1

Current taxonomic status of the genus

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15
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Table 2

Cases of neonatal sepsis associated with infection

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15
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Table 3

Selected studies of the recovery of (PMP group) from contaminated samples

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15
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Table 4

Distinguishing phenotypic properties of the PMP group

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15
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Table 5

Biogroups of

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15
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Table 6

Susceptibility of to selected antimicrobial agents

Citation: Janda J, Abbott S. 2006. The Genus Morganella, p 261-278. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch15

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