Effectiveness of ceftazidime-avibactam versus ceftolozane-tazobactam for multidrug-resistant Pseudomonas aeruginosa infections in the USA (CACTUS): a multicentre, retrospective, observational study.

Background: Ceftolozane-tazobactam and ceftazidime-avibactam are preferred treatment options for multidrug-resistant Pseudomonas aeruginosa infections; however, real-world comparative effectiveness studies are scarce. Pharmacokinetic and pharmacodynamic differences between the agents might affect clinical response rates. We aimed to compare the effectiveness of ceftolozane-tazobactam and ceftazidime-avibactam for treatment of invasive multidrug-resistant P aeruginosa infections.

Coral Community Composition Linked to Hypoxia Exposure.

Tropical reef ecosystems are strongly influenced by the composition of coral species, but the factors influencing coral diversity and distributions are not fully understood. Here we demonstrate that large variations in the relative abundance of three major coral species across adjacent Caribbean reef sites are strongly related to their different low O tolerances. In laboratory experiments designed to mimic reef conditions, the cumulative effect of repeated nightly low O drove coral bleaching and mortality, with limited modulation by temperature.

Patient, Care Partner, and Physician Voices in Treatment Decision-Making for Multiple Myeloma.

Introduction: Treatment decision-making for multiple myeloma (MM) is complex. Individuals involved in decision-making may value treatment attributes differently based on their role as a patient, care partner, or physician. This study describes those attributes, and what is most important by role.

Emergence of high-level aztreonam-avibactam and cefiderocol resistance following treatment of an NDM-producing bloodstream isolate exhibiting reduced susceptibility to both agents at baseline.

Background: Cefiderocol (FDC) or ceftazidime-avibactam with aztreonam (CZA-ATM) are frontline agents for New Delhi metallo-β-lactamase (NDM)-producing Enterobacterales; however, clinical data are scarce, and mechanisms of treatment-emergent resistance are ill-defined. Our objectives were to characterize serial isolates and stool microbiota from a liver transplant recipient with NDM-producing bacteraemia.

Methods: Isolates collected pre- and post-CZA-ATM treatment underwent broth microdilution susceptibility testing and whole-genome sequencing.