It remains one of the key questions of the current corona pandemic: Why do people infected with SARS-CoV-2 experience varying degrees of COVID-19, the disease which it triggers? Researchers, led by Professor Mascha Binder from University Hospital Halle (Saale), have investigated more than 14 million receptor sequences of B and T cells, i.e. immune cells, obtained from blood samples of COVID-19 patients. The group’s findings have been published in the journal “Immunity” (CellPress) (DOI: https://doi.org/10.1016/j.immuni.2020.06.024).