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Rapid Diagnostics for Multidrug-Resistant Organisms in Combat-Related Infection

May 10, 2016
Article

The occurrence of multidrug resistant infection is a major concern in wounded warriors and military veterans, especially in combat-related injuries. In addition to methicillin-resistant Staphylococcus aureus (MRSA), other resistant strains have been associated with hospital-acquired infections that are often not responsive to even a broad range of antibiotics. Culture-directed antibiotic treatment is an early treatment regime for these kinds of infections. However, one of the key challenges of using this treatment regime is that laboratory culture analysis, which is central to antibiotic selection, requires at least two days to produce results. The delay in targeted treatment results in greater patient distress, poorer outcomes, higher overall cost, and dilution of antibiotic effectiveness as bacteria continue to adapt.

With funding from a fiscal year 2012 Military Infectious Diseases Applied Research Award, Dr. Connie Price and her team at Denver Health are aiming to identify rapid microbiological diagnostics for multidrug resistant organism (MDRO) pathogens that afflict wounded warriors and veterans and, furthermore, would help clinicians more effectively treat patients with serious infections. Price's approach involves the use of multiplexed automated digital microscopy (MADM), which has the ability to identify and quantify multiple pathogens within two hours. In preclinical research, Price and her team have demonstrated that MADM (Figure 1) is able to characterize multiple major modes of antibiotic resistance, including MRSA, within six hours. Furthermore, Price has used MADM to characterize heterogeneous and inducible resistance and has also performed population analysis profiles of S. aureus.

Price has acquired remnant blood, respiratory, and infected wound samples and identified the causative pathogen and, most importantly, determined its susceptibility to multiple antibiotics, often one to two days faster than conventional lab methods. Since the start of the funding period, Price and her team have validated and identified (within one hour) target bacterial species including S. aureus, Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca, Enterobacter aerogenes, Enterobacter cloacae, Acinetobacter baumanii, and Pseudomonas aeruginosa with sensitivity and specificity of at least 97 percent in blood cultures. Furthermore, she has performed antibiotic susceptibility testing with specific minimum inhibitory concentration within five hours for methicillin> versus S. aureus, ciprofloxacin, imipenem, amikacin and minocycline versus A. baumanii, and ciprofloxacin and amikacin versus P. aeruginosa.

Price and her team are actively collaborating with an industry partner, Accelerate Diagnostics, Inc., to develop a novel pathogen identification and antibiotic susceptibility tests directly from study of clinical samples. The data gathered in this effort has facilitated Accelerate Diagnostics to obtain consensus from the U.S. Food and Drug Administration and clearance for the first test that will rapidly identify and determine antibiotic susceptibility of pathogens causing bloodstream infections. Additional information about Price's research can be found in the Journal of Microbiological Methods (2014; 98:50-58).

Source: U.S. Department of Defense

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