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Chapter 1 : Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance

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Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, Page 1 of 2

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Abstract:

This introductory chapter is an overview of targets for antimicrobial action and mechanisms of bacterial resistance combined with information on the nature of antibacterial drugs, their classification, and their usage in animals. On the basis of the target microorganism, drugs are classified as antiviral, antibacterial, antifungal, and antiparasitic. There are numerous definitions of bacterial resistance, which are based on different criteria (genetic, biochemical, microbiological, and clinical) and do not necessarily overlap. The two most commonly used definitions are based on microbiological (in vitro resistance) and clinical (in vivo resistance) criteria. Multiresistant clinical strains of , , serovar Enteritidis, and display in vivo mutation rates that are 1,000-fold higher than in other members of these species. There are important differences in the use of antibacterial agents in humans and animals, in particular food animals. Bacteria have developed various mechanisms to neutralize the action of antibacterial agents. The most widespread are enzymatic drug inactivation, modification or replacement of the drug target, active drug efflux, and reduced drug uptake.

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1

Key Concept Ranking

Antibacterial Agents
1.1930056
Bacterial Diseases
1.1502512
Mobile Genetic Elements
0.7445293
Viruses
0.68167436
Antiseptics and Disinfectants
0.6431808
Chemicals
0.63599813
1.1930056
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Figures

Image of Figure 1.
Figure 1.

Modes of action of antibacterial drugs inhibiting cell wall synthesis. NAG, N-acetylglucosamine; NAMA, Nacetylmuramic acid; ala, alanine; glu, glutamic acid; lys, lysine; gly, glycine; mDAP, mesodiaminopimelic acid.

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1
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Image of Figure 2.
Figure 2.

Modes of action of antibacterial drugs inhibiting nucleic acid or protein synthesis.

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1
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Download as Powerpoint
Image of Figure 3.
Figure 3.

Mechanisms of resistance to antibacterial drugs.

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1
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Download as Powerpoint

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Tables

Generic image for table
Table 1.

The antibacterial alphabet

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1
Generic image for table
Table 2.

Human health importance and clinical use of antibacterial drugs licensed for animal use in European Union countries and/or the United States

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1
Generic image for table
Table 3.

Modes of enzymatic inactivation of antibacterial drugs

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1
Generic image for table
Table 4.

Antibacterial substrate ranges of MDR efflux pumps in bacterial species that can be isolated from animals

Citation: Guardabassi L, Courvalin P. 2006. Modes of Antimicrobial Action and Mechanisms of Bacterial Resistance, p 1-18. In Aarestrup F (ed), Antimicrobial Resistance in Bacteria of Animal Origin. ASM Press, Washington, DC. doi: 10.1128/9781555817534.ch1

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