The Panther Fusion System with Open Access Functionality for Laboratory-Developed Tests for Influenza A Virus Subtyping.

Abstract:

:Nucleic acid amplification tests, such as PCR, are the method of choice for respiratory virus testing, due to their superior diagnostic accuracy and fast turnaround time. The Panther Fusion (Fusion; Hologic) system has an array of highly sensitive in vitro diagnostic (IVD) real-time PCR assays for respiratory viruses, including an assay for influenza A (FluA) virus, influenza B (FluB) virus, and respiratory syncytial virus (RSV) (FFABR assay). The Fusion system has Open Access functionality to perform laboratory-developed tests (LDTs) alongside IVD assays. We developed two LDTs for FluA virus strain typing on the Panther Fusion instrument, enabling side-by-side testing with the FFABR assay. The LDT-FAST assay uses proprietary primers and probes designed by Hologic for the Prodesse ProFAST+ (PFAST) assay. The exWHO-FAST assay is an expanded redesign of the WHO-recommended reverse transcriptase PCRs (RT-PCRs). To evaluate the performance of these two LDTs, 110 FluA virus-positive samples were tested. Of these, 104 had been subtyped previously; 54 were H3, 46 were 09H1, and 4 were fsH1. All were appropriately subtyped by both LDTs. Of the untyped FluA virus samples, three were subtyped as H3 by both LDTs and two were subtyped as H3 by the LDT-FAST assay only. The sample not subtyped by either LDT was retested with the FFABR assay and was now negative. Limit-of-detection (LOD) analyses were performed with five FluA virus strains. The LDT-FAST LODs were similar to the FFABR assay LODs, while the exWHO-FAST LODs were higher for two H3N2 strains, findings that were explained by analysis of primer/probe homology. In conclusion, either FluA virus typing assay would be a valuable complement to the Panther Fusion respiratory menu given the performance of these LDTs, the system's full automation, and the ability to split eluates for both IVD and LDT testing.

journal_name

J Clin Microbiol

authors

Stellrecht KA,Cimino JL,Maceira VP

doi

10.1128/JCM.00188-20

subject

Has Abstract

pub_date

2020-05-26 00:00:00

issue

6

eissn

0095-1137

issn

1098-660X

pii

JCM.00188-20

journal_volume

58

pub_type

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