Houssem Redha Chenane

1 INTRODUCTION Diagnostic of COVID-19 infection relies on several assays detecting either severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) antigens or viral RNA, with the gold standard being the reverse-transcriptase polymerase chain reaction (RT-PCR) performed on nasopharyngeal (NP) swabs or other respiratory samples.1 RT-PCR techniques are sensitive and allow an estimation of the viral load with the cycle threshold (CT) value.

Keywords SARS-CoV-2 Delta replication rate seroneutralization vaccination BNT162b2 vaccine Dear Editor, We read with interest the article by Dimeglio et al. , showing the importance of the SARS-CoV-2 anti-S antibody response. Along with previous results showing a strong decrease of antibody and neutralization titers after vaccination 2 Valentine Marie Ferré Samuel Lebourgeois Reyene Menidjel Gilles Collin Houssem Redha Chenane Manuella Onambele Guindi et al.