Comparative severity of COVID-19 cases caused by Alpha, Delta or Omicron SARS-CoV-2 variants and its association with vaccination Elena Varea-Jiménez; Esteban Aznar Cano; Lorena Vega-Piris; Elena Vanessa Martínez Sánchez; Clara Mazagatos; Lucía García San Miguel Rodríguez-Alarcón; Inmaculada Casas; María José Sierra Moros; Maria Iglesias-Caballero; Sonia Vazquez-Morón; Amparo Larrauri; Susana Monge;

Recovery of the increasing pattern of sexually transmitted infections (STI) after the COVID-19 pandemic: The case of gonorrhea in Catalonia, Spain Evelin López-Corbeto; Julia Valera Paloma; Marcos Montoro Fernández; Rossie Lugo Colón; Laura Clotet Romero; Víctor Guadalupe Fernandez; Pilar Ciruela Navas; Jordi Casabona Barbara;

Similar risk of hospitalization and lethality from COVID-19 in transplant recipients and waitlisted patients: A comparative analysis Abelardo Claudio Fernández Chávez; Guillermo Yovany Ordoñez León; Eva Elisa Álvarez León; Paloma Moreno Núñez; José Porto Tomás; Jesús María Aranaz Andrés;