Browsing by Author "Avendaño Valenzuela, María José"

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    Humoral waning kinetics against SARS-CoV-2 is dictated by disease severity and vaccine platform
    (2024) Tong, Xin; Kellman, Benjamin; Avendaño Valenzuela, María José; Mendu, Maanasa; Hsiao, Jeff C.; Serrano García, Eileen Francisca; García Salum, Tamara Cristal; Muena, Nicolás; Pardo Roa, Catalina; Morales, Mauricio; Levicán Asenjo, Jorge Enrique; Salinas Ortiz, Erick David; Cárdenas-Cáceres, Simone; Riquelme Pérez, Arnoldo; Tischler, Nicole D.; Lauffenburger, Douglas A.; Alter, Galit; McNamara, Ryan P.; Medina, Rafael
    SARS-CoV-2 vaccine-acquired immunity provides robust cross-variant recognition, while infection-acquired immunity can be heterogenous, with disease severity often modulating post-recovery responses. We assessed antibody waning dynamics between infection- and vaccination-acquired immunity across variants of concern (VOC). mRNA vaccination induced potent, cross-VOC Spike recognition and functional responses, but waned more rapidly for Omicron Spike. Hospitalized individuals developed more durable functional responses with lower peaks compared to mRNA vaccination, while outpatients exhibited slower decay than inactivated vaccine recipients. Humoral decay for the receptor binding domain tracked with neutralizing antibody titers, while S2-directed responses tracked with antibody-dependent myeloid cellular phagocytosis. Boosting the recovered patients with mRNA or inactivated vaccines expanded humoral breadth, durability, and restored functional responses, eliminating the severity- and platform-associated decay differences. Therefore, post-recovery hybrid immunization compensates for this distinction and broadens humoral breadth, highlighting the value of boosting immunity in previously infected individuals.
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    Surface Immunogenic Protein of Streptococcus Group B is an Agonist of Toll-Like Receptors 2 and 4 and a Potential Immune Adjuvant
    (2020) Diaz Dinamarca, D. A.; Manzo, R. A.; Soto, D. A.; Avendaño Valenzuela, María José; Bastias, D. N.; Soto, P. I.; Escobar, D. F.; Vasquez Saez, V.; Pizarro Ortega, Magdalena S.; Kalergis Parra, Alexis Mikes; Carrion, F.; Wilson, C. A. M.; Berrios, J.; Vasquez, A. E.