Related Experiment Video
Updated: Jun 20, 2026

Evaluating Virulence and Pathogenesis of Aeromonas Infection in a Caenorhabditis elegans Model
Published on: December 20, 2018
Virulence factor-activity relationships (VFAR) with specific emphasis on Aeromonas species (spp.)
Ashok K Chopra1, Joerg Graf, Amy J Horneman
1Departments of Microbiology and Immunology/WHO Collobrating Center for Tropical Diseases and center for Biodefense and Emergency Infestious Diseases, Shriners Burns Institute, UTMB, Galveston, TX 77555-1070, USA. achopra@utmb.edu
Insights
Aeromonas infections affect vulnerable populations like children and the elderly. This review details virulence factors of Aeromonas hydrophila, aiding in distinguishing pathogenic from non-pathogenic strains.
Area of Science:
- Microbiology
- Infectious Diseases
- Pathogenesis
Background:
- Aeromonas species are opportunistic pathogens causing human infections, particularly diarrhea in children.
- Infections are linked to consuming contaminated food and water, and environmental exposures like natural disasters.
- A specific subset of Aeromonas species, including Aeromonas hydrophila, Aeromonas caviae, and Aeromonas veronii biovar sobria, are primarily responsible for human diseases.
Purpose of the Study:
- To review the virulence aspects of a clinical isolate of Aeromonas hydrophila.
- To understand the pathogenesis of Aeromonas infections.
- To aid in differentiating pathogenic from non-pathogenic Aeromonas species.
Main Methods:
- Isolation of virulence factors from a diarrheal Aeromonas hydrophila isolate (SSU).
- Molecular characterization of identified virulence factors.
- Review of existing literature on Aeromonas pathogenesis and host immune response.
Main Results:
- Identification and characterization of various virulence factors from Aeromonas hydrophila.
- Understanding the role of host immune status in disease development.
- Advances in differentiating pathogenic Aeromonas strains.
Conclusions:
- Virulence factors of Aeromonas species are crucial for pathogenesis.
- Host immune status significantly influences disease outcome.
- Further understanding of Aeromonas pathogenesis aids in clinical management and prevention.
Abstract:
The human population most commonly inflicted with Aeromonas infection includes young children, the elderly and immunocompromised individuals. Importantly, the isolation rate of Aeromonas species from children suffering from diarrhea is similar in developing and developed countries. It is becoming clear that only a small subset of Aeromonas species belonging to a particular hybridization group causes disease in humans. Human infections with this pathogen occur by consuming contaminated food and water. Aeromonas species were isolated from wounds of patients during the tsunami in southern Thailand. Further, increased numbers of this pathogen were recovered from floodwater samples during Hurricane Katrina in New Orleans. Among various species of Aeromonas, A. hydrophila, A. caviae and A. veronii biovar sobria are mainly responsible for causing disease in humans. Our laboratory has isolated various virulence factors from a diarrheal isolate SSU of A. hydrophila and molecularly characterized them. In addition to various virulence factors produced by Aeromonas species, the status of the immune system plays an important role in inducing disease by this pathogen in the host. Taken together, we have made significant advances in better understanding the pathogenesis of Aeromonas infections, which will help in differentiating pathogenic from non-pathogenic aeromonads. This review covers virulence aspects of a clinical isolate of A. hydrophila.
Related Concept Videos
Regulation of Bacterial Virulence
Determinants of Bacterial Pathogenicity and Virulence
Gene Regulation in Microbial Communities: Quorum Sensing
Clinical Significance of Antibiotic Resistance
Bacterial Phylum Verrucomicrobiota
Factors Affecting the Risk of Infection
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin create...

