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;

Executive summary: Clinical practice guidelines on the management of resistant tuberculosis of the Spanish Society of Pulmonology and Thoracic Surgery (SEPAR) and the Spanish Society of Infectious Diseases and Clinical Microbiology (SEIMC) Adrian Sanchez-Montalva; José Antonio Caminero; Mª Remedio Guna; Teresa Rodrígo Sanz; Ramón Rabuñal; Joan Pau Millet; José Antonio Gullón-Blanco; Luis Anibarro; Guillermo Perez-Mendoza; Juan Francisco Medina; Verónica González-Galán; Eva Tabernero;

La vacuna frente a la COVID-19 y la confianza institucional Fermín Jesús González-Melado; María Luisa Di Pietro;