staphylococcus epidermidis biochemical test results

Other in-vitro infections are treated by the administration of antibiotic drugs that include cephalosporins like cefazolin, nafcillin, or oxacillin. [3] S. epidermidis is a particular concern for people with catheters or other surgical implants because it is known to form biofilms that grow on these devices. Note all of these tests were performed by the methods listed in the lab manual by McDonald et al. This disease may cause other diseases to occur such as endocarditis. Home » Bacteriology » Staphylococcus epidermidis- An Overview, Last Updated on October 9, 2020 by Sagar Aryal. The results were positive for urease, which eliminated all but Staphylococcus epidermidis as the Gram-positive unknown microorganism for the mixed culture of unknown 101. above mentioned tests are used for confirmation of the Staphylococcus aureus. Despite antibiotic treatment and elimination of related infection factors, medical implant infections are extremely resistant to antimicrobial agents. Table 2 lists the test, purpose, reagents, observations, and results. It also causes endocarditis, most often in patients with defective heart valves. Learn how your comment data is processed. This site uses Akismet to reduce spam. This was done to completely isolate the two separate microorganisms. Print. Vol. Understanding and distinguishing microorganisms from one another is a necessary step when trying to recognize how they play a part in not only humans, but in the world. After the Gram stain was viewed of each culture, #1 was a Gram positive Staphylococcus, culture #2 was a Gram negative rod. These enteric bacteria are facultative anaerobic Gram-negative rods, which live intestinal tracts of animals (6). By CPR Memphis at December 6, 2013 | 12:17 pm | After adding methyl red, color changed from light yellow to a darker yellow. While Staphylococcus epidermidis is not usually a pathogenic bacterium it can cause infection. [9], Biochemical tests indicate this microorganism also carries out a weakly positive reaction to the nitrate reductase test. Other forms of treatments involving the hyperimmune serum from human donors or humanized monoclonal antibodies directed towards the surface components are also being studied. Bacterium is able to hydrolyze urea using enzyme urease. Pale pink to red and opaque colonies with a rough texture and a central nipple is seen on CRA. This is chart that was used for the remainder of the study. The cell wall is made up of peptidoglycan and teichoic acid, where the peptidoglycan is the main structural polymer in the wall and plays a vital role in maintaining the spherical shape of the cell. S. epidermidis strains are often resistant to antibiotics, including rifamycin, fluoroquinolones, gentamicin, tetracycline, clindamycin, and sulfonamides. The first step that was done was taking a Trypticase Soy Agar (TSA) plate, and using the quadrant streak method as described in the lab manual, the unknown was streaked onto the plate.

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