The impact of ageing on the incidence and mortality rate of bloodstream infection: A hospital‐based case–cohort study in a tertiary public hospital of Brazil

Objective Over the past few decades, life expectancy in Brazil has increased from 48 years in 1950s to 76 years in 2017. The aim of this study was to investigate the impact of ageing on: (1) the frequency of hospitalisations due to bloodstream infection (BSI); (2) the incidence of hospital‐acquired BSI (H‐BSI); (3) the incidence of BSI caused by multidrug‐resistant (MDR) agents and (4) the mortality rate of BSI in a public hospital. Methods A hospital‐based case‐cohort study was conducted between 1 December 2013 and 31 December 2015. The data were analysed using multivariable logistic regression. Results A total of 500 BSI episodes were detected, among 11,102 hospitalizations. The incidence of hospitalisations resulting from BSI was significantly higher in older than younger patients (3.7/100 vs. 2.0/100, p