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A Japanese man with community-onset carbapenem-resistant Stutzerimonas nitrititolerans bacteremia and a sacral pressure ulcer: a case report
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A Japanese man with community-onset carbapenem-resistant Stutzerimonas nitrititolerans bacteremia and a sacral pressure ulcer: a case report
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A Japanese man with community-onset carbapenem-resistant Stutzerimonas nitrititolerans bacteremia and a sacral pressure ulcer: a case report
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Journal Article
A Japanese man with community-onset carbapenem-resistant Stutzerimonas nitrititolerans bacteremia and a sacral pressure ulcer: a case report
2025
Overview
Background
Stutzerimonas
is a recently proposed genus comprising strains formerly classified as
Pseudomonas stutzeri
. The genus includes at least 16 identified species.
Stutzerimonas nitrititolerans
, previously known as
Pseudomonas nitrititolerans
, was initially isolated from a bioreactor. Only one case of human infection has been reported to date, and its pathogenicity remains unknown.
Case presentation
We present a case of community-acquired
S. nitrititolerans
bacteremia in a 77-year-old Japanese man with a sacral pressure ulcer. On admission for cerebral infarction, empirical ampicillin/sulbactam was administered because of an infected sacral pressure ulcer. Blood cultures revealed Gram-negative bacilli. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry was unable to identify the species, but 16 S ribosomal RNA gene sequencing identified the isolate NR5426 as
S. nitrititolerans
. Despite negative results for common carbapenem-resistance genes, the strain showed possible metallo-beta-lactamase production. The patient was treated with piperacillin/tazobactam and recovered.
Conclusions
This case confirms that
S. nitrititolerans
can cause infection in humans and highlights the antimicrobial susceptibility profile and the treatment strategy for infections caused by this rare bacterium. Further studies are required to determine its resistance mechanisms and the clinical implications.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ Aged
/ Analysis
/ Anti-Bacterial Agents - pharmacology
/ Anti-Bacterial Agents - therapeutic use
/ Bedsores
/ beta-Lactam Resistance - genetics
/ Blood
/ Carbapenems - therapeutic use
/ Community-Acquired Infections - drug therapy
/ Community-Acquired Infections - microbiology
/ Genes
/ Genomes
/ Humans
/ Japan
/ Lactose
/ Male
/ Medicine
/ Multidrug resistant organisms
/ Non-fermenting Gram-negative bacilli
/ Pressure Ulcer - drug therapy
/ Pressure Ulcer - microbiology
/ Proteins
/ Pseudomonas stutzeri - drug effects
/ Pseudomonas stutzeri - genetics
/ Pseudomonas stutzeri - isolation & purification
/ RNA, Ribosomal, 16S - genetics
/ rRNA
/ Sacrum
