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Chapter 13

Antimicrobial Drugs

Book Version 6
By Boundless
Boundless Microbiology
Microbiology
by Boundless
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Section 1
Overview of Antimicrobial Therapy
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Origins of Antimicrobial Drugs

The era of antimicrobials begins when Pasteur and Joubert discover that one type of bacteria could prevent the growth of another.

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Antibiotic Discovery

Observations of antibiosis between micro-organisms led to the discovery of natural antibacterials produced by microorganisms.

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Antibiotics and Selective Toxicity

Antibiotics are able to selectively target specific types of bacteria without harming the infected host.

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Spectrum of Antimicrobial Activity

An antibiotic's spectrum can be broad or narrow.

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Antibiotic Classifications

Bactericidal antibiotics kill bacteria; bacteriostatic antibiotics slow their growth or reproduction.

Section 2
Functions of Antimicrobial Drugs
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Inhibiting Cell Wall Synthesis

β-Lactam (beta-lactam) and glycopeptide antibiotics work by inhibiting or interfering with cell wall synthesis of the target bacteria.

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Injuring the Plasma Membrane

Several types of antimicrobial drugs function by disrupting or injuring the plasma membrane.

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Inhibiting Nucleic Acid Synthesis

Antimicrobial drugs inhibit nucleic acid synthesis through differences in prokaryotic and eukaryotic enzymes.

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Inhibiting Protein Synthesis

Protein synthesis inhibitors are substances that disrupt the processes that lead directly to the generation of new proteins in cells.

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Inhibiting Essential Metabolite Synthesis

An antimetabolite is a chemical that inhibits the use of a metabolite, a chemical that is part of normal metabolism.

Section 3
Commonly Used Antimicrobial Drugs
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Synthetic Antimicrobial Drugs

An antimicrobial is a substance that kills or inhibits the growth of microorganisms such as bacteria, fungi, or protozoans.

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Naturally Occurring Antimicrobial Drugs: Antibiotics

An antimicrobial is a substance that kills or inhibits the growth of microorganisms such as bacteria, fungi, or protozoans.

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Beta-Lactam Antibiotics: Penicillins and Cephalosporins

The β-lactam ring is part of the core structure of several antibiotic families.

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Antibiotics from Prokaryotes

Most of the currently available antibiotics are produced by prokaryotes mainly by bacteria from the genus Streptomyces.

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Antimycobacterial Antibiotics

Antimycobacterial antibiotics target microbes classified as mycobacterium.

Section 4
Interactions Between Drug and Host
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Organ Toxicity

The accumulation of antimicrobial drugs and their metabolic byproducts in organs can be toxic, leading to organ damage.

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Allergic Responses to Drugs

Antimicrobrial drugs can cause immune responses which can be fatal.

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Suppression and Alteration of Microbiota by Antimicrobials

Our bodies depend upon, and host, a vast number of complex microbial flora that can be affected negatively by antimicrobial treatments.

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Effects of Drug Combinations

Antimicrobial drugs can interact with other drugs in deleterious ways or can be used in combination to combat microbial infections.

Section 5
Measuring Drug Susceptibility
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Minimal Inhibitory Concentration (MIC)

Minimum Inhibitory Concentration is the lowest drug concentration that prevents visible microorganism growth after overnight incubation.

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Kirby-Bauer Disk Susceptibility Test

Kirby-Bauer testing measures sensitivity of bacteria to antibiotics by culturing bacteria on solid growth media surrounding sources of drug.

Section 6
Drug Resistance
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Mechanisms of Resistance

Development of microbial resistance to antimicrobial agents requires alterations in the microbe's cell physiology and structure.

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Antibiotic Misuse

Antibiotic misuse is one factor responsible for the emergence of antimicrobial resistant bacterial strains.

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Cost and Prevention of Resistance

Antimicrobial resistance is a major public health and economic burden on patients, affected communities, and healthcare providers.

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Biofilms, Persisters, and Antibiotic Tolerance

Biofilms and persisters are bacterial communities responsible for chronic diseases and antibiotic tolerance.

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Finding New Antimicrobial Drugs

Antimicrobial resistance has created a public health crisis in the treatment of infectious diseases and necessitates the discovery of new drugs.

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Antimicrobial Peptides

Antimicrobial peptides exhibit cytotoxic activity against all microbes.

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Antisense Agents

Antisense agents are short oligonucleotides that bind to target messenger RNA and inhibit protein synthesis.

Section 7
Antiviral Drugs
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Antiviral Agents that Prevent Virus Uncoating or Release

Different approches are used to target the initial and final steps of a virus life cycle.

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Antiviral DNA Synthesis Inhibitors

Inhibiting DNA synthesis during viral replication is another key approach in battling viral infections.

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Nucleotide and Nonnucleotide Reverse Transcriptase Inhibitors

Reverse transcriptase in viruses is inhibited by nucleoside (nucleotide) analogues or drugs that change the conformation of the enzyme.

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Protease Inhibitors

Protease inhibitors target viral proteases which are key enzymes for the completion of viral maturation.

Section 8
Other Antimicrobial Drugs
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Antifungal Drugs

The development of antifungal drugs focuses on the classes of mycotic diseases for which fungi are responsible.

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Antiprotozoan and Antihelminthic Drugs

Antiprotozoan and antihelminthic drugs are characterized based on structure and the mechanism of action by which they target the organism.

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Chapter 13
Antimicrobial Drugs
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  • Functions of Antimicrobial Drugs
  • Commonly Used Antimicrobial Drugs
  • Interactions Between Drug and Host
  • Measuring Drug Susceptibility
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