RT Journal Article T1 Heterologous gam-COVID-vac (sputnik V)/mRNA-1273 (moderna) vaccination induces a stronger humoral response than homologous sputnik V in a real-world data analysis. A1 Pereson, Matías J A1 Amaya, Lucas A1 Neukam, Karin A1 Baré, Patricia A1 Echegoyen, Natalia A1 Badano, María Noel A1 Lucero, Alicia A1 Martelli, Antonella A1 Garcia, Gabriel H A1 Videla, Cristina A1 Martínez, Alfredo P A1 Di Lello, Federico A K1 Gam-COVID-Vac K1 Heterologous scheme K1 SARS-CoV-2 K1 Vaccine K1 mRNA-1273 AB To compare the homologous prime-boost vaccination scheme of Gam-COVID-Vac (Sputnik V (SpV)) to its heterologous combination with mRNA-1273 (Moderna (Mod)) vaccine. SARS-CoV-2 anti-spike (S)-receptor binding domain (RBD) IgG concentration was assessed three to seven weeks after complete vaccination. Reactogenicity was evaluated by declared side events and medical assistance required until day 7 post boost. Of 190 participants enrolled, 105 received homologous SpV/SpV and the remaining heterologous SpV/Mod vaccination scheme, respectively. Median (interquartile range (IQR)) age was 54 (37-63) years, 132 out of 190 (69.5%) were female, and 46 out of 190 (24.2%) individuals had a prior confirmed COVID-19. Anti-S-RBD IgG median (IQR) titers were significantly higher for SpV/Mod (2511 (1476-3992) binding antibody units (BAU)/mL) than for SpV/SpV (582 (209-1609) BAU/mL; p  The heterologous SpV/Mod combination against SARS-CoV-2 is well tolerated and significantly increases humoral immune response as compared to the homologous SpV/SpV immunization. YR 2022 FD 2022-05-17 LK http://hdl.handle.net/10668/22131 UL http://hdl.handle.net/10668/22131 LA en DS RISalud RD Apr 12, 2025