Illustration from Scientific Research

Schematic of the study groups. Individuals received two doses of mRNA vaccine BNT162b2 (n = 48, blue) or mRNA-1273 (n = 19, pink), one dose of the vector DNA Ad26.COV2.S vaccine (n = 25, yellow), or two doses of the vector DNA vaccine AZD1222 (n = 19, violet). Blood was collected after the final immunization time point (with a median of 8, 8, 34, and 7 days from the final dose, respectively).

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