Legionella species are important etiologic agents of sporadic and epidemic community-acquired and nosocomial respiratory disease. The list of species continues to expand, and tools for classification and characterization of isolates have become increasingly sophisticated. These organisms are associated with aquatic habitats and are transmitted by aerosol or direct contact. Bacterial culture is the cornerstone of laboratory diagnosis. Careful surveillance of infections is important, because infections potentially can be prevented.
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Legionella Pneumonia Undetected by Repeated Urinary Antigen Testing With Ribotest® Legionella.
Cureus
November 2024
Department of Clinical Infectious Diseases, Tokoname City Hospital, Tokoname, JPN.
This report presents a patient with pneumonia (LP), initially presented with fever and mild hypoxemia, with subsequent progression to severe pneumonia during hospitalization. Despite multiple negative urinary antigen tests using Ribotest , the diagnosis was confirmed via the loop-mediated isothermal amplification method of lower respiratory tract secretions. This case highlights the diagnostic limitations of Ribotest and emphasizes the importance of a comprehensive diagnostic strategy, incorporating nucleic acid amplification tests or culture in suspected patients with LP.
View Article and Find Full Text PDFComparison of whole genome sequencing typing tools for the typing of Belgian Legionella pneumophila outbreaks isolates.
Eur J Clin Microbiol Infect Dis
December 2024
Department of Microbiology and Infection Control, National Reference Centre for Legionella Pneumophila, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel), Laarbeeklaan 101, 1090, Brussels, Belgium.
Whole genome sequencing (WGS) marks a turning point for outbreak investigations for microorganisms related to public health matters, like Legionella pneumophila (Lp). Here, we evaluated the available Lp WGS typing tools for isolates of previously documented Belgian outbreaks, as well as small groups of related and non-related isolates. One reference strain and 77 clinical and environmental isolates were evaluated.
View Article and Find Full Text PDFBroth microdilution protocol for determining antimicrobial susceptibility of Legionella pneumophila to clinically relevant antimicrobials.
J Microbiol Methods
December 2024
Medical Microbiology, Division of Infection and Immunity, Cardiff University, Cardiff, UK; UK Health Security Agency, Bacteriology Reference Department, London, UK. Electronic address:
Currently there is no detailed, internationally agreed protocol defined to evaluate antimicrobial susceptibility testing (AST) for Legionella pneumophila (required to establish epidemiological cut-off value or "ECOFF" boundaries); therefore, antimicrobial resistance in these isolates cannot be defined. AST methods utilising media containing activated charcoal as an ingredient, to enable Legionella growth, are unreliable as noted in an internationally authored opinion paper and a new gold standard is required. Here we define a detailed protocol for broth microdilution (BMD) using defined cell culture collection-deposited control reference strains (Philadelphia-1 and Knoxville-1) as well as two accessible reference strains with moderately (lpeAB-carrying) and markedly (23S rRNA mutation-carrying) elevated azithromycin minimum inhibitory concentration (MIC).
View Article and Find Full Text PDFMeningitis due to Gemella sp. in a patient with severe ENT conditions: case report and review of the literature.
Ann Clin Microbiol Antimicrob
December 2024
Laboratoire de Microbiologie, Centre Hospitalier de Valenciennes, Valenciennes, F-59300, France.
In June 2022, a 73-year-old man with a history of laryngeal and esophageal carcinoma was admitted to the emergency unit with sudden fever, confusion, and general condition deterioration. Initial assessments showed a fever of 38.5 °C, elevated C-reactive protein (CRP) at 209 mg/L, and a neutrophil count of 10.
View Article and Find Full Text PDFBacterial contamination of new dental unit waterlines and efficacy of shock disinfection.
BMC Microbiol
December 2024
Université de Lorraine, Faculté d'odontologie, 54500, Vandœuvre-Lès-Nancy, France.
Background: Bacterial contamination of outlet water from dental unit waterlines (DUWLs) may lead to healthcare-associated infection. The aim of this study was to evaluate the contamination of DUWLs from new dental chairs before and after their initial shock disinfection with ICX Renew® and to determine the efficacy of this method of shock disinfection.
Methods: The microbiological quality of water samples obtained from the DUWLs of 17 new dental chairs installed at the University Hospital of Nancy, France, was assessed.
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