Viral RNA was extracted with QIAamp Viral RNA Mini Kit (QIAGEN), RNeasy Mini Kit (QIAGEN) and MagMAXTM Viral/Pathogen II Nucleic Acid Isolation Kit (Thermo Fisher Scientific). We quantified viral RNA by real time RT-PCR analysis with a one-step RT-qPCR kit (THUNDERBIRD Probe One-step RT-qPCR kit, TOYOBO) using 5′-ACAGGTACGTTAATAGTTAATAGCGT-3′ for forward primer and 5′-ATATTGCAGCAGTACGCACACA-3′ for reverse primer, and a 5′-FAM-ACACTAGCCATCCTTACTGCGCTTCG-3′ probe, as described (Corman et al., 2020 (link)). The detection limit of SARS-CoV-2 RNA in this study was 39 cycle (Ct value).
Free full text: Click here