Antibiotic Sensitivity Essay

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Antibiotic Sensitivity Lab Report: Microbes with an Emphasis on E. col Microbiology 225 March 25, 2011 Abstract Antibiotics are a major contribution to our world, but with the misuse and overuse of them, many bacteria are starting to become more resistant. One of the studies that researchers use to measure resistance of microorganisms to antibiotics is the Kirby Bauer test. This test has enabled doctors to evaluate which antibiotic is best to treat different microbacteria. Within our microbiology class we were given four different bacteria to study resistance using the Kirby Bauer method. These organisms which are Staphylococcus epidermidis, Staphylococcus aureus, Pseudomonas aeriginosa, and Escherichia coli (E. coli) were tested against Penicillin, Tetracycline, Bacitracin, and Ciprofloxacin. Each bacterium had a different reaction to each antibiotic that was placed on the agar plate. Viewing the different reactions that Escherichia coli had to each antibiotic helped us understand a little more about bacteria that are gram negative vs. gram positive bacteria. Introduction The past century has seen dramatic increases in the technology and science of the medical world with the discovery of antibiotics marking a new era for combating once life threatening organisms. Once feared microorganisms like Staphylococcus epidermises, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli are able to be battled with different antibiotics. With many antibiotics being misused, many micro bacteria are becoming immune to once effective drugs. A useful test in measuring the effectiveness of antibiotics to bacteria is the Kirby Bauer test. The Kirby Bauer test is an experiment in which antibiotic soaked disks are placed on a known bacterium, if the bacteria are susceptible to the antibiotic you will see a clearing or halo around the disk; this
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