RENBP and infection: The strong dependence of antigen test results from the Ct value of the samples for freshly collected samples (Table 6), coupled with the significantly lower median Ct value for samples collected <7 days from symptoms onset, and the significantly higher median Ag concentration indicates that the best performances of the Lumipulse® G SARS-CoV-2 Ag assay are obtained in patients at early stages of the infection.