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Persister Cells Lab Report

Decent Essays

Abstract
This project involves analyzing persister cells—slow-growing, multi-drug tolerant populations of bacteria—to expand the current knowledge of the formation and persistence of chronic biofilm infections associated with total joint arthroplasties (TJAs). Currently, popular bone cements—poly(methyl methacrylate) (PMMA) spacers and calcium sulfate (CaSO4) beads—are impregnated with antibiotics, and placed at the surgical site to kill these primary infections. It is known that antibiotics such as tobramycin and vancomycin inhibit the metabolic activity of in vitro lawn biofilms of these clinical species. However, persister cells slowly arise after long-term, local antibiotic elution at levels well above measured minimum inhibitory …show more content…

to spread, millions of people each year experience chronic infections (Figure 1). , The effectiveness of conventional antibiotics is restrained due to resistance and the difficulty of culturing the bacteria to determine the species causing the infection. If the infection becomes chronic, typically, removal and replacement of the joint is required, resulting in a total joint explant surgery. However, loss of function of the affected body part or life-threatening complications can also ensue. Furthermore, slow growing, small, temporary populations of bacteria that appear to be multidrug-tolerant, called persisters, present in some of these infections. These are highly tolerant to antibiotics, and can form a later, chronic infection from their ability to persist and re-establish.
In an attempt to preserve a primary joint or prevent a possible second infection after revision, nonabsorbable PMMA cement and absorbable cements such as CaSO4 beads can be antibiotic-loaded to fight bacterial infections, and placed into the site of suspected infection as vessels. PMMA is used in a structural role to stabilize the implant in bone tissue or provide an articulating spacer. CaSO4 assists in the regeneration of bone, but is not used for structural integrity due to its weaker strength. PMMA and CaSO4 beads are commonly infused with antibiotics such as

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