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Front Cell Infect Microbiol ; 12: 904602, 2022.
Article in English | MEDLINE | ID: mdl-35782141

ABSTRACT

An epidemiological study uncovered that fluoroquinolone (FQ) neutropenic prophylaxis in hematopoietic cell transplant and hematologic malignancy (HCT/HM) patients was associated with breakthrough Pseudomonas aeruginosa bloodstream infections (BSIs) with isolates non-susceptible to both FQs and meropenem. The molecular epidemiology of the FQ/meropenem-non-susceptible P. aeruginosa isolates causing FQ-breakthrough BSIs in the HCT/HM patients remains unclear. Through whole genome sequencing on 57 P. aeruginosa isolates from 54 patients diagnosed with HM or receiving an HCT, we found that ST111 strains predominated, accounting for 22 (38.6%) of the isolates. 17 of 33 (51.5%) FQ-breakthrough BSIs were caused by ST111 strains, of which 15 (88.2%) were meropenem non-susceptible. ST111 strains, but not other oprD-deficient, meropenem-non-susceptible clinical strains, were found to have a colonization advantage over P. aeruginosa strain PA14 in C. elegans and to outcompete PA14 in in vitro co-culture assays. Together, we found that breakthrough P. aeruginosa BSIs during FQ prophylaxis in HCT/HM patients are dominated by clonally-related FQ/meropenem non-susceptible strains, predominantly ST111 type, and that the dominance of ST111 strains may be explained by a relative fitness advantage over other clinical strains. Additional work is necessary to better understand the factors driving the dominance and persistence of these ST111 strains.


Subject(s)
Hematologic Neoplasms , Hematopoietic Stem Cell Transplantation , Pseudomonas Infections , Animals , Caenorhabditis elegans , Carbapenems/pharmacology , Carbapenems/therapeutic use , Fluoroquinolones/metabolism , Hematologic Neoplasms/complications , Hematopoietic Stem Cell Transplantation/adverse effects , Humans , Meropenem/therapeutic use , Microbial Sensitivity Tests , Pseudomonas Infections/drug therapy , Pseudomonas Infections/epidemiology , Pseudomonas aeruginosa/metabolism , Transplant Recipients
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