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We evaluated the investigational use only (IUO) version of the rapid Verigene Gram-negative blood culture test (BC-GN), a microarray that detects 9 genus/species targets (Acinetobacter spp., Citrobacter spp., Enterobacter spp., Escherichia coli/Shigella spp., Klebsiella oxytoca, Klebsiella pneumoniae, Proteus spp., Pseudomonas aeruginosa, and Serratia marcescens) and 6 antimicrobial resistance determinants (blaCTX-M, blaKPC, blaNDM, blaVIM, blaIMP, and blaOXA) directly from positive blood cultures. BC-GN was performed on positive BacT/Alert Pediatric FAN and Bactec Peds Plus blood cultures with Gram-negative organisms at two tertiary pediatric centers. Vitek MS (bioMérieux, Durham, NC) was used to assign gold standard organism identification. The Check MDR CT-102 microarray (Check Points B.V., Wageningen, Netherlands) was used as an alternative method for detecting resistance determinants. In total, 104 organisms were isolated from 97 clinical blood cultures. BC-GN correctly detected 26/26 cultures with Acinetobacter spp., P. aeruginosa, and S. marcescens, 5/6 with Citrobacter spp., 13/14 with Enterobacter spp., 23/24 with E. coli, 2/3 with K. oxytoca, 16/17 with K. pneumoniae, and 0/1 with Proteus spp. BC-GN appropriately reported negative BC-GN results in 8/13 blood cultures that grew organisms that were not represented on the microarray but failed to detect targets in 3/5 cultures that grew multiple Gram-negative organisms. BC-GN detected 5/5 and 1/1 clinical blood cultures with blaCTX-M and blaVIM. All 6 results were corroborated by Check MDR CT-102 microarray testing. The Verigene BC-GN test has the potential to expedite therapeutic decision making in pediatric patients with Gram-negative bacteremia. Sensitivity was satisfactory but may be suboptimal in mixed Gram-negative blood cultures.

journal of clinical microbiology

Pediatric Multicenter Evaluation of the Verigene Gram-Negative Blood Culture Test for Rapid Detection of Inpatient Bacteremia Involving Gram-Negative Organisms, Extended-Spectrum Beta-Lactamases, and Carbapenemases