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• W4200584711 abstract "<sec> <title>BACKGROUND</title> Blood cultures are the cornerstone of diagnosis for detecting the presence of bacteria or fungi in the blood, with an average detection time of 48 hours and failure to detect a pathogen occurring in approximately 50% of patients with sepsis. Rapid diagnosis would facilitate earlier treatment and/or an earlier switch to narrow-spectrum antibiotics. </sec> <sec> <title>OBJECTIVE</title> The aim of this study is to develop and implement a multiplex droplet digital polymerase chain reaction (ddPCR) assay as a routine diagnostic tool in the detection and identification of pathogens from whole blood and/or blood culture after 3 hours of incubation. </sec> <sec> <title>METHODS</title> The study consists of three phases: (1) design of primer-probe pairs for accurate and reliable quantification of the most common sepsis-causing microorganisms using a multiplex reaction, (2) determination of the analytical sensitivity and specificity of the multiplex ddPCR assay, and (3) a clinical study in patients with sepsis using the assay. The QX200 Droplet Digital PCR System will be used for the detection of the following species-specific genes in blood from patients with sepsis: <i>coa</i> (staphylocoagulase) in <i>Staphylococcus aureus</i>, <i>cpsA</i> (capsular polysaccharide) in <i>Streptococcus pneumoniae</i>, <i>uidA</i> (beta-D-glucuronidase) in <i>Escherichia coli</i>, <i>oprL</i> (peptidoglycan-associated lipoprotein) in <i>Pseudomonas aeruginosa</i>, and the highly conserved regions of the 16S rRNA gene for Gram-positive and Gram-negative bacteria. All data will be analyzed using QuantaSoft Analysis Pro Software. </sec> <sec> <title>RESULTS</title> In phase 1, to determine the optimal annealing temperature for the designed primer-probe pairs, results from a gradient temperature experiment will be collected and the limit of detection (LOD) of the assay will be determined. In phase 2, results for the analytical sensitivity and specificity of the assay will be obtained after an optimization of the extraction and purification method in spiked blood. In phase 3, clinical sensitivity and specificity as compared to the standard blood culture technique will be determined using 301 clinical samples. </sec> <sec> <title>CONCLUSIONS</title> Successful design of primer-probe pairs in the first phase and subsequent optimization and determination of the LOD will allow progression to phase 3 to compare the novel method with existing blood culture methods. </sec> <sec> <title>INTERNATIONAL REGISTERED REPORT</title> PRR1-10.2196/33746 </sec>" @default.
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• W4200584711 date "2021-09-22" @default.
• W4200584711 modified "2023-09-26" @default.
• W4200584711 title "Multiplex Droplet Digital Polymerase Chain Reaction Assay for Rapid Molecular Detection of Pathogens in Patients With Sepsis: Protocol for an Assay Development Study (Preprint)" @default.
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• W4200584711 doi "https://doi.org/10.2196/preprints.33746" @default.
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