Evaluation of Fourier transform-infrared spectroscopy (FT-IR) as a control measure for nosocomial outbreak investigations.

Autor:	Uribe G; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Salipante SJ; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Curtis L; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Lieberman JA; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Kurosawa K; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Cookson BT; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Hoogestraat D; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Stewart MK; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA., Olmstead T; Department of Psychiatry and Behavioral Sciences, University of New Mexico , Albuquerque, New Mexico, USA., Bourassa L; Department of Laboratory Medicine and Pathology, University of Washington , Seattle, Washington, USA.
Jazyk:	angličtina
Zdroj:	Journal of clinical microbiology [J Clin Microbiol] 2023 Oct 24; Vol. 61 (10), pp. e0034723. Date of Electronic Publication: 2023 Oct 03.
DOI:	10.1128/jcm.00347-23
Abstrakt:	Whole-genome sequencing (WGS) provides greater resolution than other molecular epidemiology strategies and is emerging as a new gold standard approach for microbial strain typing. The Bruker IR Biotyper is designed as a screening tool to identify bacterial isolates that require WGS to establish accurate relationships, but its performance and utility in nosocomial outbreak investigations have not been thoroughly investigated. Here, we evaluated the IR Biotyper by retrospectively examining isolates tested by WGS during investigations of potential nosocomial transmission events or outbreaks. Ninety-eight clinical isolates from 14 different outbreak investigations were examined: three collections of Acinetobacter baumannii ( n = 2, n = 9, n = 5 isolates in each collection), one of Escherichia coli ( n = 16), two of Pseudomonas aeruginosa ( n = 2 and n = 5), two of Serratia marcescens ( n = 9 and n = 7), five of Staphylococcus aureus ( n = 8, n = 4, n = 3, n = 3, n = 17), and one of Stenotrophomonas maltophilia ( n = 8). Linear regression demonstrated a weak, positive correlation between the number of pairwise genome-wide single-nucleotide polymorphisms (SNPs) and IR Biotyper spectral distance values for Gram-positive ( r = 0.43, P ≤ 0.0001), Gram-negative ( r = 0.1554, P = 0.0639), and all organisms combined ( r = 0.342, P ≤ 0.0001). Overall, the IR Biotyper had a positive predictive value (PPV) of 55.81% for identifying strains that were closely related by genomic identity, but a negative predictive value (NPV) of 86.79% for identifying unrelated isolates. When experimentally adjusted cut-offs were applied to A. baumannii, P. aeruginosa , and E. coli, the PPV was 62% for identifying strains that were closely related and the NPV was 100% for identifying unrelated isolates. Implementation of the IR Biotyper as a screening tool in this cohort would have reduced the number of Gram-negative isolates requiring further WGS analysis by 50% and would reduce the number of S. aureus isolates needing WGS resolution by 48%. Competing Interests: The authors declare no conflict of interest.
Databáze:	MEDLINE
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