Three Separate Spike Antigen Exposures by COVID-19 Vaccination or SARS-CoV-2 Infection Elicit Strong Humoral Immune Responses in Healthcare Workers by Thomas Theo Brehm, Felix Ullrich, Michelle Thompson, Julia Küchen, Dorothee Schwinge, Anthea Spier, Samuel Huber, Johannes K. Knobloch, Martin Aepfelbacher, Marylyn M. Addo, Ansgar W. Lohse, Marc Lütgehetmann, Julian Schulze zur Wiesch

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