Spike- and RBD-specific memory B cells could be detected at 4 weeks (d56) and 5 months (d180) after the second dose, revealing that memory B cells persisted despite a decreasing trend over a 5-month time frame between second and third immunization (Fig. 2a, c ).
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Robust induction of B cell and T cell responses by a third dose of inactivated SARS-CoV-2 vaccine.
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