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To effectively fight off SARS-CoV-2, the immune system depends on both antibodies and T cells, a type of white blood cell, which work together to eradicate the virus. However, little was known about virus-specific T cells in asymptomatic patients. We now know that many people are getting infected with SARS-CoV-2 without realising it, as they stay healthy and don t develop any symptoms. These asymptomatic infections may provide the key to understanding how the immune system can control the virus without triggering pathological processes, explained Dr Nina Le Bert, Senior Research Fellow at the Duke-NUS Emerging Infectious Diseases (EID) Programme and the co-author of this study.