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Chapter 18 : The Genus

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Abstract:

Like many enteric bacteria, the genus has a checkered past in regard to taxonomy and nomenclature. The genus currently consists of a single species, . is not a common hospital-acquired pathogen, but sporadic cases of nosocomial infections have been reported. This chapter discusses the clinical distribution of and the laboratory identification that includes isolation, genomospecies and biotypes. There are a very limited number of research publications on the pathogenicity of hafniae. Many of these pathogenicity studies were performed with strains that are now known not to belong to the genus but rather to the genus . Due to their low incidence in human disease, large-scale investigations of the antimicrobial susceptibility profiles of have not been performed to date. Recent reports have addressed the susceptibility of hafniae to newer antimicrobial agents and are listed in this chapter. On the basis of 16S rRNA gene sequencing, a collection of 52 strains was clearly separated into two distinct clusters. Five biochemical tests were determined to be useful in the separation of these two species, with utilization of malonate and fermentation of D-arabinose the most discriminatory characters; utilization of β-glucosides (salicin and esculin) was strongly associated with DNA group 1.

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18

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Figure 1

16S rRNA gene sequencing data of 30 isolates. Data points indicate sequence divergence from ATCC 13337 (DNA group 1) and ATCC 29927 (DNA group 2). Some data points represent multiple strains (our unpublished data).

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Figure 2

Phage lysis assay. True isolates are lysed by phage 1672, producing clear zones; -like isolates are not lysed by this bacteriophage (left lower quadrant).

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Tables

Generic image for table
Table 1

Current taxonomic makeup within

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
Generic image for table
Table 2

Genetic relatedness of DNA groups within

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
Generic image for table
Table 3

Phenotypic properties separating DNA groups within

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
Generic image for table
Table 4

Clinical distribution of

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
Generic image for table
Table 5

Outbreaks of -associated gastroenteritis

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Table 6

Cases of bacteremia

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Table 7

Identification of by commercial systems

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Table 8

Tests useful in distinguishing strains from -like organisms

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Table 9

Separation of DNA groups within

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Table 10

Expanded Barbe biotyping scheme

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18
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Table 11

Susceptibility of to newer antimicrobial agents

Citation: Janda J, Abbott S. 2006. The Genus , p 321-334. In The Enterobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/9781555817541.ch18

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