Usefulness of BioFire FilmArray BCID2 for Blood Culture Processing in Clinical Practice

Benjamin Berinson, Anna Both, Laura Berneking, Martin Christner, Marc Lütgehetmann, Martin Aepfelbacher, Holger Rohde, Benjamin Berinson, Anna Both, Laura Berneking, Martin Christner, Marc Lütgehetmann, Martin Aepfelbacher, Holger Rohde

Abstract

Rapid pathogen characterization from positive blood cultures (BC) can improve management of patients with bloodstream infections (BSI). The FilmArray blood culture identification (BCID) assay is a molecular test approved for direct identification of BSI causing pathogens from positive BC. A recently updated version of the panel (BCID2) comprises improved species identification characteristics and allows for the detection of one expanded-spectrum β-lactamase (ESBL)- and several carbapenemase-encoding genes. Here, the clinical performance of the BCID2 assay for species identification in 180 positive BCs was evaluated. BCID2 results were concordant with the standard of care (SOC) in 159/180 (88.3%) BCs; 68/74 (91.9%) and 71/74 (96.0%) of all samples growing monobacterial, Gram-positive or Gram-negative pathogens, respectively, were identified, in agreement with SOC results. Nonconcordance was related to the detection of additional pathogens by the BCID2 assay (n = 4), discrepant species identification (n = 4), or failure of BCID2 to detect on-panel pathogens (n = 1). A number (12/31; 38.7%) of discordant results became evident in polymicrobial BC specimens. BCID2 identified the presence of blaCTX-M-carrying species in 12 BC specimens but failed to predict third-generation cephalosporin resistance in four isolates exhibiting independent cephalosporin resistance mechanisms. Carbapenem resistance related to the presence of blaVIM-2 or blaOxa-48-like was correctly predicted in two isolates. In conclusion, the BCID2 assay is a reliable tool for rapid BC processing and species identification. Despite inclusion of common ESBL- or carbapenemase-encoding markers, the multifactorial nature of β-lactam resistance in Gram-negative organisms warrants combination of BCID2 with (rapid) phenotypic susceptibility assays.

Keywords: FilmArray; blood culture; diagnostics; molecular methods; multiplex PCR; rapid tests; resistance; sepsis; species identification; technical evaluation.

Figures

FIG 1
FIG 1
Flowchart showing the inclusion and results/interpretation of isolates. The discrepancies are presented in more detail in Table 1.

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