AUTHOR=Zhao Mingwei , Tang Kai , Liu Fengsheng , Zhou Weidong , Fan Jun , Yan Guangxuan , Qin Shibing , Pang Yu 

TITLE=Metagenomic Next-Generation Sequencing Improves Diagnosis of Osteoarticular Infections From Abscess Specimens: A Multicenter Retrospective Study

JOURNAL=Frontiers in Microbiology

VOLUME=11

YEAR=2020

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2020.02034

DOI=10.3389/fmicb.2020.02034

ISSN=1664-302X

ABSTRACT=<p><bold>Background</bold>: We conducted this retrospective study to reveal the accuracy of metagenomic next-generation sequencing (mNGS) for diagnosing osteoarticular infections from fresh abscess specimens obtained from patients in an HIV-naive population.</p><p><bold>Methods</bold>: We retrospectively analyzed hospital records at three participating TB-specialized hospitals for patients admitted with suggestive diagnoses of osteoarticular tuberculosis between January 2018 and August 2019. Abscess specimens obtained from each patient were tested <italic>via</italic> pathogen culture, GeneXpert <italic>Mycobacterium tuberculosis</italic> (MTB)/rifampicin (RIF), and mNGS assay.</p><p><bold>Results</bold>: A total of 82 abscess samples were collected from patients with osteoarticular infections, including 53 cases with (64.6%) bacterial, 21 (25.6%) with mycobacterial, 7 (8.5%) with fungal, and 1 (1.2%) with actinomycetal organisms detected. Analysis of mNGS assay results identified potential pathogens in all cases, with <italic>M. tuberculosis</italic> complex (MTBC) most frequently isolated, followed by <italic>Staphylococcus aureus</italic> and <italic>Brucella melitensis</italic>. Conventional culture testing identified causative pathogens in only 48.4% of samples, a significantly lower rate than the mNGS pathogen identification rate (100%, <italic>p</italic> &lt; 0.01). Culture-positive group specimens yielded significantly greater numbers of sequence reads than did culture-negative group specimens (<italic>p</italic> &lt; 0.01). Of patients receiving surgical interventions and mNGS-guided treatment, 76 (92.7%) experienced favorable outcomes by the time of follow-up assessment at 3 months post-treatment. Notably, MTBC detection in two patients experiencing treatment failure suggests that they had mixed infections with MTBC and other pathogens.</p><p><bold>Conclusion</bold>: Results presented here demonstrate that mNGS has a greater pathogen detection rate in osteoarticular infections than conventional culture-based methods.</p>