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Study design. 79 patients were enrolled in the study; all of them had positive SARS-CoV-2 RT-PCR and were unvaccinated against SARS-CoV-2. Blood was drawn and nasopharyngeal swabs were taken approximately 10–15 days later to perform an antigen test, virus cultivation, an ELISpot assay and SARS-CoV-2 RT-PCR. Given the fact that the second SARS-CoV-2 PCR was positive, a follow-up PCR was performed around 7 days later.
