Abstract: |
Background: We analyzed the effect of peri-transplant prophylaxis on the epidemiology of bacteremia in a 12-year contemporary cohort of allogeneic HSCT recipients at our center. Methods: This was an observational study of 1052 consecutive adult HSCT from 2000 to 2011. Formal prophylaxis with vancomycin only, fluoroquinolone (FQ) only, or vancomycin+FQ was implemented in 2006. The cumulative incidence of day 100 bacteremia was compared between the Early Period (2000-2005) and the Recent Period (2006-2011). Predictors for pre-engraftment bacteremia were analyzed with Cox-proportional hazard models in a subcohort of 821 HSCT who received myeloablative or reduced intensity conditioning (MA/RIC). Results: The incidence of bacteremia decreased in the Recent Period (32% vs 27%; P=0.002), whereas the rates of resistance in gram-negative rods (GNR) and vancomycin-resistant enterococci (VRE) were similar between the two Periods (. P values are not statistically significant.) In multivariate analyses, prophylaxis with vancomycin only or vancomycin+FQ was protective (HR=0.5; CI=0.30-0.72) and (HR=0.3; CI=0.12-0.52, P<0.01). Vancomycin or vancomycin+FQ eliminated viridans streptococcal bacteremia (VSB); vancomycin+FQ decreased GNR bacteremia (HR=0.35; CI=0.15-0.85). Conclusions: Vancomycin-based prophylaxis peri-transplant in MA/RIC HSCT was associated with elimination of VSB and may be considered at centers with high incidence of this infection. |