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Chapter 11 : Hospital Infections: Gram-Negative Bacteria

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Abstract:

In this chapter, a few key examples of gram-negative bacteria, especially those that are considered saprophytes, are highlighted in which molecular biology methods were used to elucidate the epidemiology of hospital infections. The major clinical manifestations of infections caused by gram-negative organisms include bacteremia, urinary tract infection, pneumonia, intra-abdominal infections, and surgical wound infections. The major gram-negative bacterial pathogens associated with nosocomial infections are , , , and spp. Others include spp., spp., spp., spp., and . In the current Bush-Jacoby-Medeiros classification method, β-lactamases are divided into four main groups based on their substrate activity against penicillin, carbenicillin, oxacillin, cephaloridine, cefotaxime, aztreonam, and imipenem. possesses outer membrane proteins that are part of multidrug efflux systems, which can catalyze the energy-dependent extrusion of different classes of antibiotics. Quinolone (e.g., ciprofloxacin) resistance in (as well as in other gram-negative organisms) can be mediated by mutations that occur in DNA gyrase. Genotyping tests have shown that in cystic fibrosis patients with chronic infection, a patient may harbor the same genotype for decades. Gram-negative bacteria, especially those that reside in natural environmental habitats, are nearly impossible to categorize as pathovars or nonpathovars. Nevertheless, it is clear that molecular epidemiologic approaches to studying these organisms have yielded new epidemiologic knowledge that could not have been obtained from traditional epidemiologic and laboratory methods.

Citation: Riley L. 2004. Hospital Infections: Gram-Negative Bacteria, p 281-305. In Molecular Epidemiology of Infectious Diseases. ASM Press, Washington, DC. doi: 10.1128/9781555817688.ch11

Key Concept Ranking

Outer Membrane Proteins
0.4937631
Bacterial Classification
0.43682277
Urinary Tract Infections
0.43254107
Gram-Negative Bacilli
0.4296782
Pulsed-Field Gel Electrophoresis
0.42669985
0.4937631
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Tables

Generic image for table
Table 11.1

Classification of bacterial β-lactamases

Adapted from reference 7.

CA, clavulanic acid.

ND, not determined.

Citation: Riley L. 2004. Hospital Infections: Gram-Negative Bacteria, p 281-305. In Molecular Epidemiology of Infectious Diseases. ASM Press, Washington, DC. doi: 10.1128/9781555817688.ch11

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