Gut microbiota profiling in hematopoietic stem cell transplant recipients: Towards personalized medicine.

BACKGROUND: Antibiotic resistance in bacteria is a cause for concern, especially in hematopoietic stem cell transplant (HSCT) patients. Endogenous bowel microflora in HSCT patients get replaced by hospital multidrug resistant flora and pose risk of serious bacterial infection during the pre-engraftment stage. For decades, many methods to reduce the translocation of gut microbiota in HSCT patients have been attempted. Despite the logic, of using prophylactic antibiotics, there is no consensus on standard regimen. Personalized antibiotic prophylaxis-based on gut microbiota and clinical profile has been suggested by researchers. In this study, gut microbiota in HSCT recipients has been studied with antimicrobial susceptibility testing and detection of various antibiotic resistance phenotypes. METHODS: Seventy-six HSCT patients (2016-2018) were included. Stool surveillance cultures and antibiotic susceptibility testing were performed. Bacterial isolates were classified into various antibiotic resistance phenotypes. RESULTS: This study revealed that 73.75% HSCT recipients had gut colonized with antibiotic resistance microbiota which included extended-spectrum ß-lactamase-, multidrug- and extensively drug-resistant phenotypes. CONCLUSION: This study reiterates the importance of individual profiling of gut microbiota in HSCT patients.