data collection for demographic data (age, gender, hospital admission and discharge date, length of stay, hospitalization prior to current hospital stay (acute care facilities, long-term healthcare centres, nursing homes), discharge destination, outcome, cause of death, travel history, previous exposure to antibiotics and proton pump Inhibitors)

data collection for clinical data (comorbidities, Charlson Comorbidity Index, immunosuppressive treatment, date of diagnosis of CPB, days between hospital admission and diagnosis of CPB, type of consecutive infection, indwelling vascular hardware, urinary catheterization, surgical therapies)

data collection for treatment data (antibiotic therapy, immunosuppressive therapy, concomitant medication)

data collection for microbiological data (species of CPB, type of sample, date of sample, history of colonization or infection with any antibiotic resistant pathogen)

incidence of CPB at the University Hospital Basel (number)

time to detection of CPB (days)

time to initiation of infection control measures