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22nd December 2020 Product update: rapidmicrobiology staff writer
Three Surface Tests for SARS-CoV-2 Receive AOAC Validation
AOAC INTERNATIONAL has issued Certificates of Validation for three proprietary test kits that detect SARS-CoV-2 on environmental surfaces.
The three tests are the first to pass the rigorous independent evaluation required by the globally recognized AOAC Research Institute’s Performance Tested MethodsSM Program, which implemented an Emergency Response Validation process to accelerate the review process.
“Food manufacturers and contract labs have stringent protocols to ensure their facilities are free of harmful pathogens and more recently, viruses,” said Erin Crowley, president of AOAC INTERNATIONAL. “Now, they also have independently validated tests they can use to ensure their sanitation protocols are effective and they continue to provide a culture of safety for their essential employees.”
In this initial phase of the validation process, test kits were evaluated for detection of the virus on stainless steel surfaces only. AOAC will expand validation to a broader range of environmental surfaces and food matrices in a follow-up project.
While SARS-CoV-2 is known to be susceptible to standard disinfection methods,1 recent studies have shown that it can also be highly persistent on non-porous surfaces2 such as stainless steel.
Certifications were issued for the VERIPRO® SARS-CoV-2 Environmental Assay by bioMérieux; EnviroX-Rv by PathogenDx, and COVID-19 Indoor Test™ by Phylagen.
The bioMérieux VERIPRO SARS-CoV-2 Environmental Assay uses molecular, one-step, reverse transcription polymerase chain reaction (RT-PCR) technology for qualitative detection of SARS-CoV-2.
The VERIPRO SARS-CoV-2 Environmental Assay can be performed without the need for an optional RNA purification step. No clinical supplies or reagents are required to run the VERIPRO SARS-CoV-2 Environmental Assay, freeing up critical clinical COVID-19 testing resources. The test is commercially available and can be run on all GENE-UP® Real-Time PCR systems.
The PathogenDx EnviroX-Rv assay is a test based on end-point RT-PCR coupled to DNA microarray hybridization for the detection of multiple genes within SARS-CoV-1 and SARS-CoV-2 viruses.
The advantage of the EnviroX-Rv assay is its ability to deliver a higher level of sensitivity as demonstrated by its lower limit of detection in comparison to the reported qRT-PCR assays approved by the U.S. Food and Drug Administration Emergency Use Authorization.
Additionally, the DNA microarray provides unmatchable multiplexing power where numerous viruses and clades can be detected off a single swab at an affordable cost. The test is already in commercial use and available.
The COVID-19 Indoor Test™ by Phylagen is a SARS-CoV-2 qualitative detection method that extracts the SARS-CoV-2 RNA from environmental swabs and detects it utilizing RT- PCR technology. Environmental surface swabs are collected by the customer and shipped back to Phylagen, Inc. for sample processing.
Sample data are analyzed, and results are reported through a tracking portal. The test is commercially available for sampling surfaces and is a single site method for the detection portion of the test method.
This validation project broke new ground by employing in silico (“in silicon”) analytical techniques that harness modern computational power to compare results against large databases of genetic information.
This has a significant advantage over traditional “wet-lab” testing in that genetic sequences from tens of thousands of strains of SARS-CoV-2 and near neighbours could be analyzed for inclusivity and exclusivity. Moreover, obtaining and shipping large numbers of SARS-CoV-2 strains and variants necessary for comparison could be difficult and potentially dangerous.
AOAC received validation applications for nine test kits in this initial phase of the program. In addition to the three that have received certification, four are in the final stages of certification and two are being revised for re-submission.
“The extraordinary depth and precision of in silico analysis in this Emergency Response Validation Program are remarkable,” said Scott Coates, AOAC Research Institute Director. “Some kits are demonstrating over 97% perfect matches for more than 15,000 SARS-CoV-2 genomes when traditionally we can only test against 100 species, strains or variants. This is world-class research conducted in double-time tempo.”
1. “Stability of SARS-CoV-2 in different environmental conditions”, The Lancet Vol. 1 Issue 1, May 1, 2020.
2. “The effect of temperature on persistence of SARS-CoV-2 on common surfaces”, Virology Journal, 7 October 2020.
Date Published: 22nd December 2020
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Note: This content has been edited by a rapidmicrobiology staff writer for style and content.
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