An analysis of the effects of antibiotic resistance in bacteria

Design Systematic review with meta-analysis.

An analysis of the effects of antibiotic resistance in bacteria

Download File Part One - Background For decades medical doctors have been giving patients antibiotics to help fight infections. An antibiotic is a substance that slows down or stops bacterial growth. There are a variety of antibiotics.

Not all antibiotics work on every bacteria. Therefore it is important to know which antibiotics are most effective against bacteria. How do you determine that? This lab shows you one method of measuring the effectiveness of an antimicrobial agent against bacteria grown in culture.

This is called the Kirby-Bauer disk-diffusion method, and here is how it works.

An analysis of the effects of antibiotic resistance in bacteria

The bacteria of interest is swabbed uniformly across a culture plate. Then a filter-paper disk, covered with the antibiotic to be tested, is placed on the surface of the agar.

The compound diffuses out from the filter paper into the agar. The concentration of the compound will be higher next to the disk, and will decrease gradually as distance from the disk increases. If the compound is effective against bacteria at a certain concentration, no colonies will grow wherever the concentration in the agar is greater than or equal to that effective concentration.

This region where no colonies of bacteria grow is called the "zone of inhibition. Second paragraph taken from Sciencebuddies. On each dish we added the bacteria Bacillus subtillus and three antibiotic discs: We also added a blank disc to act as the control.

The purpose of the control is two-fold. First, it shows us what normal growth of bacteria looks like. Second, it shows us that the antibiotics, and not the paper, are affecting the bacteria. We left the petri dishes in an incubator over night so they could grow.

The next day we observed the affects of the antibiotics on the bacteria. Below you fill find a sample image of what a similar lab looks like. The person who conducted this lab used many more antibiotics. They did use a control but it is not visible in this petri dish.

Measure the zone of inhibition around each antibiotic disk. To do this, measure the diameter of the zone of inhibition. Record this data in the appropriate space on your data table.Bacteria possess a remarkable number of genetic mechanisms for resistance to antibacterials and there is a substantial pool of antibiotic resistance genes in nature that have evolved over millions of years.

Analysis of organisms and epidemiological data suggest that the evolution and spread of multidrug-resistant organisms have accelerated dramatically over the past 50 years.

Understanding how antibiotics and antibiotic resistance impact the environment, and how to mitigate the effects, is part of the One Health approach to antimicrobial stewardship.

An analysis of the effects of antibiotic resistance in bacteria

Antibiotic residues can follow several paths into the environment. Antibiotic resistance is the ability of bacteria to withstand the antimicrobial power of antibiotics. Simply put, antibiotics that used to cure an infection may not work anymore. Antibiotic resistance is a global threat, and The US Center’s for Disease Control and Prevention (CDC) considers antibiotic resistance one of their top concerns.

antibiotic-resistant bacteria. Methods For this systematic review and meta-analysis, we searched PubMed, the Cochrane Database of Systematic Reviews, the Cochrane Central Register of Controlled Trials, and Web of Science for studies published from Jan 1, Antibiotic resistance in general has been a problem for as long as antibiotics have existed and is considered an urgent threat to public health; in the fight to slow it .

Antimicrobial resistance (AMR or AR) is the ability of a microbe to resist the effects of medication that once could successfully treat the microbe. The term antibiotic resistance (AR or ABR) is a subset of AMR, as it applies only to .

Low antibiotic levels in the environment may spur resistance | CIDRAP