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Bacterial infections are frequent complications occurring after autologous hematopoietic stem-cell transplantation (AHSCT). Herein, we identified the bacterial ecology and its antibiogram in AHSCT patients. We assessed the incidence, contributing factors and outcome of prolonged neutropenia and bacteremia post-AHSCT in the absence of antibacterial prophylaxis.METHODOLOGYThis is a retrospective chart review of 190 adult patients who underwent AHSCT for lymphoma and multiple myeloma, between 2005 and 2015 at a Lebanese hospital.RESULTSMost of the isolated bacteria originated from urine (49%) followed by blood (30%) and were mainly Gram-negative (70%). Fluoroquinolone susceptibility was 57% among Gram-negative and Gram-positive isolates. Bacteremia was documented in 12.6% of the patients, with a predominant gram-negative etiology having 95% susceptibility to fluoroquinolones. The duration of neutropenia, < or > 7 days, did not affect the incidence of bacteremia (11% vs. 14% respectively, p = 0.17). Patients with lymphoma were more likely to have prolonged neutropenia compared to those with myeloma (p < 0.0001). The use of a central line and the development of central-line infections were significantly higher in Gram-positive bacteremia (p = 0.03, p = 0.008 respectively). Mucositis occurred more in Gram-negative bacteremia (p = 0.02). Total mortality rate was 3.7% in the whole population and that attributed to bacteremia was 12.5% in the bacteremia subgroup. Bacteremia was a predictor for mechanical ventilation (p = 0.003), septic shock and mortality (p = 0.025).CONCLUSIONSince organisms causing bacteremia were still highly susceptible to fluoroquinolones and that the duration of neutropenia post-AHSCT didn't affect bacteremia, we concluded that fluoroquinolone prophylaxis is still valid yet, with close monitoring of resistance.

Epidemiology of bacteremia after autologous hematopoietic stem cell transplantation in the absence of antibiotic prophylaxis