Original article
Comparative severity of COVID-19 cases caused by Alpha, Delta or Omicron SARS-CoV-2 variants and its association with vaccination
Gravedad comparativa de los casos de COVID-19 causados por las variantes Alfa, Delta u Ómicron de SARS-CoV-2 y su asociación con la vacunación
Elena Varea-Jiméneza, Esteban Aznar Canob, Lorena Vega-Pirisa, Elena Vanessa Martínez Sánchezb,c, Clara Mazagatosa,c, Lucía García San Miguel Rodríguez-Alarcónb, Inmaculada Casasc,d, María José Sierra Morosb,e, Maria Iglesias-Caballerod, Sonia Vazquez-Morónd, Amparo Larrauria,c, Susana Mongea,e,
, the Working group for the surveillance and control of COVID-19 in Spain* and RELECOV** f
Corresponding author
a National Centre of Epidemiology – Institute of Health Carlos III, Madrid, Spain
b Centre for the Coordination of Alerts and Health Emergencies – Ministry of Health, Madrid, Spain
c CIBER Epidemiology and Public Health, Spain
d National Centre of Microbiology – Institute of Health Carlos III, Madrid, Spain
e CIBER Infectious Diseases, Spain
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