Validation Study for PathogenDx EnviroX-Rv Assay for the Detection of SARS-CoV-2 from Stainless Steel Environmental...

Area of Science:

• Environmental microbiology
• Molecular diagnostics
• Infectious disease detection

Background:

• The PathogenDx EnviroX-Rv assay utilizes endpoint PCR and DNA microarray technology for SARS-CoV-2 detection.
• This assay targets the causative agent of COVID-19 from environmental swabs on stainless steel surfaces.

Purpose of the Study:

• To validate the PathogenDx EnviroX-Rv assay under the Emergency Response Validation (ERV) Performance Tested Method(s) (PTM) program.
• To assess the assay's performance in detecting SARS-CoV-2 from environmental surfaces.

Main Methods:

• In silico analysis of over 41,000 SARS-CoV-2 sequences for specificity.
• Evaluation against more than 50 exclusivity organisms, including near neighbors and background contaminants.
• Unpaired study design on stainless steel surfaces, compared against the CDC's 2019-nCoV RT-PCR Diagnostic Panel.

Main Results:

• In silico analysis confirmed high specificity, distinguishing SARS-CoV-2 from similar organisms.
• The EnviroX-Rv assay identified more positive replicates compared to the CDC method.
• The assay's sensitivity is attributed to its requirement for only one target present for a positive result.

Conclusions:

• The EnviroX-Rv assay demonstrated rapid and accurate detection of SARS-CoV-2 RNA on stainless steel surfaces.
• The assay can detect SARS-CoV-2 at concentrations as low as 2000 genomic copies per 2 × 2" area.
• Dual PCR and hybridization techniques ensure high accuracy in detecting SARS-CoV-2 from environmental surfaces.