Article
Author: Troncoso, Daniel ; Molto, Jose ; Navarro-Pérez, Jorge ; Bernad, Laia ; Aurrecoechea, Elena ; García, Patricia Muñoz ; Moros, Alexandra ; Pérez-Caballero, Raúl ; Cañete, Manuel ; Alvarez-Mon, Melchor ; Trinité, Benjamin ; Gallemí, Marçal ; Imaz-Ayo, Natale ; Izquierdo-Useros, Nuria ; Ferrer, Laura ; Garriga, Carme ; López Fernández, María Jesús ; Blanco, Julià ; Corominas, Júlia ; Arribas, Jose R ; Meijide, Susana ; Soriano, Alex ; Pradenas, Edwards ; González-González, Luis ; Prat, Teresa ; Benet, Susana ; Prenafeta, Antoni ; Clotet, Bonaventura ; Lucas, Rafael Ortí ; Madrenas, Laia ; Güell, Irina ; Queiruga Parada, Javier ; Vázquez Jiménez, María Del Mar ; Raïch-Regué, Dàlia ; Esteban, Ignasi ; Bailón, Lucía ; Anagua, Jesse Omar ; Taleb, Rachel Abu ; G Prado, Julia ; Martí Lluch, Ruth ; McSkimming, Paula ; Martínez-Gómez, Xavier ; Arana-Arri, Eunate ; Nava, Jocelyn ; Forner Giner, Maria José ; Corpes Comes, Aida ; Rodríguez Fernández, Sara ; Borobia, Alberto M ; Camacho-Arteaga, Lina ; Barreiro, Antonio ; Plana, Montserrat ; de la Villa, Sofía ; Otero Romero, Susana ; Torroella, Èlia ; Ramos, Rafel
The HIPRA-HH-2 was a multicentre, randomized, active-controlled, double-blind, non-inferiority phase IIb clinical trial comparing the immunogenicity and safety of the PHH-1V adjuvanted recombinant vaccine as a heterologous booster against homologous booster with BNT162b2. Interim results demonstrated strong humoral and cellular immune response against the SARS-CoV-2 Wuhan-Hu-1 strain and the Beta, Delta, and Omicron BA.1 variants up to day 98 post-dosing. Here we report that these responses with PHH-1V are sustained up to 6 months, including in participants over 65 years, despite their smaller sample size. The PHH-1V booster was non-inferior in eliciting neutralizing antibodies for SARS-CoV-2 Omicron XBB.1.5 variant compared to BNT162b2 after 6 months. No severe COVID-19 cases occurred in any group, and mild cases were similar (50.4 % for PHH-1V vs. 47.8 % for BNT162b2). While both groups may have reached comparable immunity levels, these findings suggest that the PHH-1V vaccine provides long-lasting immunity against various of SARS-CoV-2 variants. ClinicalTrials.gov Identifier: NCT05142553.