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Virulence of Bacillus cereus: a multivariate analysis
J Minnaard1, L Delfederico, V Vasseur
1Centro de Investigación y Desarrollo en Criotecnología de Alimentos, Cátedra de Microbiología, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Argentina.
This study reveals that Bacillus cereus group strains exhibit varied biological activities and virulence gene profiles. Strain characteristics, including ribopatterns and toxin gene presence, correlate with their ability to damage human enterocytes.
Area of Science:
- Microbiology
- Molecular Biology
- Food Safety
Background:
- The Bacillus cereus group comprises pathogenic bacteria with diverse virulence factors.
- Understanding the genetic basis and biological activities of these strains is crucial for assessing foodborne illness risks.
Purpose of the Study:
- To investigate the biological activities and virulence gene profiles of Bacillus cereus group strains.
- To determine correlations between genetic makeup, ribopatterns, and pathogenic effects on human enterocytes.
Main Methods:
- Assessed biological activities (hemolysis, cytotoxicity) on Caco-2 cells and rabbit red blood cells.
- Detected virulence gene sequences (entS, nhe, hbl, etc.) using PCR.
- Characterized strains using automated ribotyping and analyzed data with principal component analysis.
Main Results:
- Observed strain-dependent variations in cytotoxicity, necrosis, detachment, and hemolytic activity.
- Identified distinct patterns in virulence gene presence and ribotyping clusters.
- Correlated specific virulence genes (entS, nheC, sph) and gene complexes (hbl) with enhanced enterocyte detachment.
Conclusions:
- Bacillus cereus group virulence is multifactorial, influenced by a combination of toxin genes and strain-specific characteristics.
- Ribopatterns and the presence of specific toxin genes are correlated with observed biological activities.
- Certain strains possessing all tested virulence genes demonstrated significant enterocyte detachment.
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