Identification and Validation of Clinical Phenotypes in Staphylococcus Aureus Bacteremia and Their Association With Mortality and Development of Complicated Bacteremia

The goal of this observational study is to determine retrospectively whether different patient clinical phenotypes (adults and children) develop Staphylococcus aureus bacteremia.The main questions it aims to answer qre: 1. Evaluate its reproducibility and correlation with mortality 2. Derive and validate a simplified probabilistic model for phenotype assignment 3. External validation of the simplified probabilistic phenotype assignment model found and its association with mortality and development of complicated bacteremia in a prospective cohort 4. Apply microbiological, biochemical and immunological techniques to explain the physiopathological and genetic mechanisms underlying the phenotypes.