Essay On Methicillin-Resistant Staphylococcus Aureus

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Methicillin-Resistant Staphylococcus aureus, or MRSA, is a form of bacteria that can be found on the skin, hair, nose and throats of humans and animals (, 2015). This bacteria is a strain of the wild- type Staphylococcus Aureus. According to Merriam Webster’s Dictionary, Staphylococcus comes from the Greek staphylē, meaning bunch of grapes, and the New Latin suffix –coccus. Aureus comes from the Latin root meaning gold, or golden (Merriam-Webster, 2015). This can be directly related to the characteristics of the bacteria because it can be found in grape-like clusters. In addition, it is found to have a golden tint when it is grown on a petri dish. Founded in 1961, this form of bacteria is resistant to the antibiotics, such as…show more content…
We tested the effectiveness of the antibiotics on the bacteria by using the Kirby-Bauer disk diffusion technique. For this method one places bacteria onto an agar in a petri dish in order for it to spread and grow across the dish. Once the bacteria has grown on the petri dish we place antibiotic disks for about 48 hours, and this will cause the bacteria to surround the disk and create an area called the Zone of inhibition. The zone of inhibition (ZOI) is the area in which the antibiotic disk has prevented the bacteria from growing any further. Next, we measure the diameter of the zone of inhibition in millimeters. The larger the zone of inhibition the more effective the antibiotic was against the bacteria. If there is no zone of inhibition present this can interpreted as a non-effective, and its zone of inhibition is equal to…show more content…
It was the only bacteria that had an effect on both the wild-type and methicillin-resistant bacteria. More specifically, it was the most effective against the wild-type bacteria. It had a mean ZOI of 20.8 mm, whereas, in the methicillin resistant bacteria it had a mean of 11.8 mm. In addition, vancomycin had the smallest standard deviation in each experiment, therefore, the values of each ZOI were not too far from the mean. Thus, because there was a small amount of variation between each value, the measurements stayed consistent. In addition, vancomycin was not the only bacteria that was effective against the bacteria. XR21347 was effective against the methicillin-resistant with a mean ZOI of 12.7 mm, and Methicillin was effective against the wild-type with a mean ZOI of 23.3 mm. All in all, based on our results vancomycin was the only antibiotic that had an effect against on both bacteria, therefore, we consider it to be the most effective. However, one could do further research by observing the effects of this antibiotic when used in the human body. By doing so one could verify that the vancomycin antibiotic is the most effective against staphylococcus
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