German scientists made a surprising observation last year: There are people who have never had contact with Sars-CoV-2 but still have memory immune cells that recognized the pathogen despite its novelty. At the time, the team of researchers from the Charité in Berlin and the Max Planck Institute for Molecular Genetics (MPIMG) attributed the observation to the fact that these so-called T helper cells had to deal with more harmless cold coronaviruses in the past.

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