Related Experiment Video

Updated: Jul 4, 2026

Use of Galleria mellonella as a Model Organism to Study Legionella pneumophila Infection
12:30

Use of Galleria mellonella as a Model Organism to Study Legionella pneumophila Infection

Published on: November 22, 2013

Cytopathogenicity and molecular subtyping of Legionella pneumophila environmental isolates from 17 hospitals

M Garcia-Nuñez1, M L Pedro-Botet, S Ragull

  • 1Infectious Diseases Section, Fundació Institut d'Investigació Germans Trias i Pujol, Badalona, Autonomous University of Barcelona, Badalona, Barcelona, Spain. mgarcia.igtp.germanstrias@gencat.net

Epidemiology and Infection
|June 10, 2008
PubMed

Insights

Legionella pneumophila isolates from hospital water systems show varying cytopathogenicity. Serogroup 1 strains were most potent, indicating a higher risk for hospital-acquired Legionnaires' disease.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Environmental Health

Background:

  • Legionella pneumophila is a bacterium found in water systems.
  • Hospital-acquired Legionnaires' disease is a serious concern.
  • Understanding bacterial virulence factors is crucial for risk assessment.

Purpose of the Study:

  • To evaluate the cytopathogenicity of Legionella pneumophila isolates from hospital environments.
  • To correlate cytopathogenicity with serogroup, genetic diversity, and disease occurrence.

Main Methods:

  • Assessed cytopathogenicity using the 50% cytopathic effect dose (CPED50) in U937 macrophages.
  • Analyzed isolates based on serogroup and pulsed-field gel electrophoresis (PFGE) patterns.
  • Correlated findings with reported hospital-acquired Legionnaires' disease cases.

Main Results:

  • All 22 L. pneumophila isolates infected and grew in macrophages.
  • L. pneumophila serogroup 1 isolates exhibited significantly higher cytopathogenicity (P=0.003).
  • A trend linked higher cytopathogenicity to multiple PFGE patterns and reported disease cases.

Conclusions:

  • Environmental L. pneumophila cytopathogenicity is a key factor in risk assessment.
  • Contaminated hospital water reservoirs pose a risk for Legionnaires' disease acquisition.
  • Serogroup and genetic diversity may predict the virulence of environmental L. pneumophila.

More Related Videos

Tractable Mammalian Cell Infections with Protozoan-primed Bacteria13:54

Tractable Mammalian Cell Infections with Protozoan-primed Bacteria

Published on: April 2, 2013

Related Concept Videos

Atypical Pneumonia01:14

Atypical Pneumonia

Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...
Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
Methods of Classification and Identification01:28

Methods of Classification and Identification

Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
Rapid Identification of Pathogens01:25

Rapid Identification of Pathogens

MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...