INTRODUCTION: Outcomes from Staphylococcus aureus bacteremia (SAB) in solid organ transplant (SOT) recipients are poorly understood. METHODS: This is a prospective cohort study comparing the bacterial genotype and clinical outcomes of SAB among SOT and non-transplant (non-SOT) recipients from 2005 to 2019. Each subject's initial S. aureus bloodstream isolate was genotyped using spa typing and assigned to a clonal complex. RESULTS: A total of 103 SOT and 1783 non-SOT recipients with SAB were included. Bacterial genotype did not differ significantly between SOT and non-SOT recipients (p = .4673), including the proportion of SAB caused by USA300 (13.2% vs. 16.0%, p = .2680). Transplant status was not significantly associated with 90-day mortality (18.4% vs. 29.5%; adjusted odds ratio [aOR] 0.74; 95% confidence interval [CI]: 0.44, 1.25), but was associated with increased risk for septic shock (50.0% vs. 21.8%; aOR 2.31; 95% CI: 1.48, 3.61) and acute respiratory distress syndrome (21.4% vs. 13.7%; aOR 2.03; 95% CI: 1.22, 3.37), and a significantly lower risk of metastatic complications (33.0% vs. 45.5%; aOR 0.49; 95% CI: 0.32, 0.76). No association was found between bacterial genotype and 90-day mortality (p = .6222) or septic shock (p = .5080) in SOT recipients with SAB. CONCLUSIONS: SOT recipients with SAB do not experience greater mortality than non-SOT recipients. The genotype of S. aureus bloodstream isolates in SOT recipients is similar to that of non-SOT recipients, and does not appear to be an important determinant of outcome in SOT recipients with SAB.
INTRODUCTION: Outcomes from Staphylococcus aureus bacteremia (SAB) in solid organ transplant (SOT) recipients are poorly understood. METHODS: This is a prospective cohort study comparing the bacterial genotype and clinical outcomes of SAB among SOT and non-transplant (non-SOT) recipients from 2005 to 2019. Each subject's initial S. aureus bloodstream isolate was genotyped using spa typing and assigned to a clonal complex. RESULTS: A total of 103 SOT and 1783 non-SOT recipients with SAB were included. Bacterial genotype did not differ significantly between SOT and non-SOT recipients (p = .4673), including the proportion of SAB caused by USA300 (13.2% vs. 16.0%, p = .2680). Transplant status was not significantly associated with 90-day mortality (18.4% vs. 29.5%; adjusted odds ratio [aOR] 0.74; 95% confidence interval [CI]: 0.44, 1.25), but was associated with increased risk for septic shock (50.0% vs. 21.8%; aOR 2.31; 95% CI: 1.48, 3.61) and acute respiratory distress syndrome (21.4% vs. 13.7%; aOR 2.03; 95% CI: 1.22, 3.37), and a significantly lower risk of metastatic complications (33.0% vs. 45.5%; aOR 0.49; 95% CI: 0.32, 0.76). No association was found between bacterial genotype and 90-day mortality (p = .6222) or septic shock (p = .5080) in SOT recipients with SAB. CONCLUSIONS: SOT recipients with SAB do not experience greater mortality than non-SOT recipients. The genotype of S. aureus bloodstream isolates in SOT recipients is similar to that of non-SOT recipients, and does not appear to be an important determinant of outcome in SOT recipients with SAB.
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