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Vaccination schedule and blood sample collection: serum samples were collected before vaccination (d0), and seven days after each dose of vaccine (d1, d2 and d3). Vaccine schedule was I and II dose 21 days apart, and III dose 6 months following the II dose. All volunteers received BioNTech/Pfizer as t I and II dose, whereas for the III dose either BioNTech/Pfizer or a half-dose of Moderna were administered.
