Abstract
Aim: To evaluate a label-free and variant-independent assay called direct virus capture (DVC) for detection of intact SARS-CoV-2 virions through light scattering, utilizing an optical inverted laser microscope called nano eye device virus detector (NED-VD). Methods: The DVC assay involves the interaction between ACE2 receptors printed on a glass coverslip substrate, and the S protein on the outer surface of virions. The study was conducted using 191 human swab specimens. Results: In comparison to the RT-PCR assay, the DVC method achieved a sensitivity of 40.5%, specificity of 90.4% and accuracy of 46%. Conclusion: The study presents a promising qualitative pre-screening test to evaluate the presence of whole virions and reduce the number of PCR tests.
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