Of the Ag-RTDs that were not available to us, Mak et al. determined the performance of the BIOCREDIT COVID-19 rapid test using a ten-fold serial dilution of a SARS-CoV-2 virus isolate and respiratory samples from confirmed COVID-19 patients taken directly into viral transport media (VTM) or phosphate-buffered saline (PBS). Here, RENBP is linked to COVID-19.