Trends and outcomes in community-onset and hospital-onset Staphylococcus bacteremia among hospitals in the United States from 2015 to 2020

We investigated trends in (staph) bacteremia incidence stratified by methicillin susceptibility (methicillin-susceptible [MSSA] vs. methicillin-resistant [MRSA]) and onset designation (community-onset [CO] vs. hospital-onset [HO]). We evaluated the microbiological data among adult patients who were admitted to 267 acute-care hospitals during October 1, 2015, to February 28, 2020. Using a subset of data from 41 acute-care hospitals, we conducted a retrospective cohort study to assess patient demographics, characteristics, mortality, length of stay, and costs. We also conducted a case-control study between those with and without staph bacteremia. The incidence of MSSA bacteremia significantly increased from 2.43 per 1,000 admissions to 2.87 per 1,000 admissions (estimate=0.0047, -value=.0006). The incidence of MRSA significantly increased from 2.11 per 1,000 admissions to 2.42 per 1,000 admissions (estimate=0.0126, -value