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- SARS-CoV-2 Infection Drives a Glycan Switch of Peripheral T Cells at DiagnosisPublication . Alves, Inês; Vicente, Manuel Machado; Gaifem, Joana; Fernandes, Ângela; Dias, Ana Mendes; Rodrigues, Cláudia Sousa; Oliveira, José Carlos; Seixas, Nair; Malheiro, Luis; Abreu, Miguel; Sarmento e Castro, Rui; Pinho, Salomé SoaresCOVID-19 is a highly selective disease in which SARS-CoV-2 infection can result in different clinical manifestations ranging from asymptomatic/mild to severe disease that requires hospitalization. In this study, we demonstrated that SARS-CoV-2 infection results in a glycosylation reprogramming of circulating lymphocytes at diagnosis. We identified a specific glycosignature of T cells, defined upon SARS-CoV-2 infection and apparently triggered by a serological factor. This specific glycan switch of T cells is detected at diagnosis being more pronounced in asymptomatic patients. We further demonstrated that asymptomatic patients display an increased expression of a viral-sensing receptor through the upregulation of DC-SIGN in monocytes. We showed that higher levels of DC-SIGN in monocytes at diagnosis correlates with better COVID-19 prognosis. This new evidence pave the way to the identification of a novel glycan-based response in T cells that may confer protection against SARS-CoV-2 infection in asymptomatic patients, highlighting a novel prognostic biomarker and potential therapeutic target.