Browsing by Author "Vizcaya Altamirano, Cecilia"

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    Kinetic of humoral response induced by SARS-CoV-2 infection in convalescent plasma receptors and donors
    (WILEY, 2021) Barrera, Aldo; Martinez Valdebenito, Constanza; Rojas Orellana, Luis; Vizcaya Altamirano, Cecilia; Elena Ceballos, Maria; Pereira, Jaime; Chang, Mayling; Mondaca, Sebastian; Sarmiento, Mauricio; Ross, Patricio; Henriquez, Carolina; Nervi, Bruno; Ferres, Marcela; Balcells, Elvira; Le Corre, Nicole
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    SARS-CoV-2 vaccine booster in solid organ transplant recipients previously immunised with inactivated versus mRNA vaccines: A prospective cohort study
    (2022) Dib Marambio, Martín Javier; Le Corre Pérez, Monique Nicole; Ortiz Koh, Catalina Alejandra; García, Daniel; Ferrés, Marcela; Martínez Valdebenito, Constanza; Ruiz-Tagle, Cinthya; Ojeda Valenzuela, María José; Espinoza Sepúlveda, Manuel Antonio; Jara Contreras, Aquiles; Arab Verdugo, Juan Pablo; Rabagliati B., Ricardo; Vizcaya Altamirano, Cecilia; Ceballos, María Elena; Sarmiento Maldonado, Mauricio; Mondaca Contreras, Sebastián Patricio; Viñuela Morales, Macarena Rocío; Pastore Thomson, Antonia; Szwarcfiter Neiman, Vania; Galdames Lavín, Elizabeth Alejandra; Barrera Vásquez, Aldo Vincent; Castro Gálvez, Pablo Federico; Gálvez Arriagada, Nicolás Marcelo Salvador; Soto Ramírez, Jorge Andrés; Bueno Ramírez, Susan; Kalergis Parra, Alexis Mikes; Nervi Nattero, Bruno; Balcells Marty, María Elvira
    Solid-organ transplant (SOT) recipients have worse COVID-19 outcomes than general population and effective immunisation in these patients is essential but more difficult to reach. We aimed to determine the immunogenicity of an mRNA SARS-CoV-2 vaccine booster in SOT recipients previously immunised with either inactivated or homologous SARS-CoV-2 mRNA vaccine. Methods: Prospective cohort study of SOT recipients under medical care at Red de Salud UC-CHRISTUS, Chile, previously vaccinated with either CoronaVac or BNT162b2. All participants received a BNT162b2 vaccine booster. The primary study end point was anti-SARS-CoV-2 total IgG antibodies (TAb) seropositivity at 8-12 weeks (56-84 days) post booster. Secondary end points included neutralising antibodies (NAb) and specific T-cell responses. Findings: A total of 140 (50% kidney, 38% liver, 6% heart) SOT recipients (mean age 54 [13.6] years; 64 [46%] women) were included. Of them, 62 had homologous (three doses of BNT162b2) and 78 heterologous vaccine schedules (two doses of CoronaVac followed by BNT162b2 booster). Boosters were received at a median of 21.3 weeks after primary vaccination. The proportion achieving TAb seropositivity (82.3% vs 65.4%, P = 0.035) and NAb positivity (77.4% vs 55.1%, P = 0.007) were higher for the homologous versus the heterologous group. On the other hand, the number of IFN-γ and IL-2 secreting SARS-CoV-2-specific T-cells did not differ significantly between groups. Interpretation: This cohort study shows that homologous mRNA vaccine priming plus boosting in SOT recipients, reaches a significantly higher humoral immune response than inactivated SARS-CoV-2 vaccine priming followed by heterologous mRNA booster.