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Evaluating Virulence and Pathogenesis of Aeromonas Infection in a Caenorhabditis elegans Model
Published on: December 20, 2018
Vibrio cholerae and Aeromonas: do they share a mutual host?
Yigal Senderovich1, Yana Gershtein, Etti Halewa
1Department of Evolutionary and Environmental Biology, Faculty of Science and Science Education, University of Haifa, Haifa, Israel.
The ISME Journal
|March 5, 2008
Summary
Aeromonas bacteria, an emerging pathogen, were found to inhabit chironomid insect egg masses in freshwater. This discovery identifies a potential natural reservoir for Aeromonas, crucial for understanding and controlling its spread in water systems.
Area of Science:
- Environmental microbiology
- Aquatic entomology
- Pathogen research
Background:
- Aeromonas species are emerging human pathogens found in aquatic environments, causing significant gastroenteritis.
- The natural reservoir of Aeromonas remains unknown despite their established presence in water.
- Chironomid insects, widespread in freshwater, are known to be infested by bacteria like Vibrio cholerae.
Purpose of the Study:
- To investigate the natural reservoir of Aeromonas species.
- To determine if chironomid egg masses serve as a habitat for Aeromonas.
- To assess the potential health risks associated with Aeromonas found in chironomid egg masses.
Main Methods:
- Collection and culturing of chironomid egg masses from a waste stabilization pond and river over five months.
- Isolation and identification of bacterial colonies from egg masses.
- Testing isolates for egg mass degradation abilities and identifying Aeromonas species.
- Detection of virulence-associated genes in isolated Aeromonas species.
Main Results:
- Aeromonas species were identified as natural inhabitants of chironomid egg masses, alongside Vibrio cholerae.
- A high prevalence of virulence-associated genes (alt, ahpB, act/aerA/hlyA, fla, pla/lipH3/apl-1/lip, ast) was detected in these Aeromonas isolates.
- The degradation of egg masses by these bacteria suggests a mechanism impacting insect reproduction.
Conclusions:
- Chironomid egg masses represent a significant natural reservoir for Aeromonas species.
- Aeromonas inhabiting chironomid egg masses possess virulence factors, posing a potential health risk.
- Understanding this reservoir is vital for controlling Aeromonas in water systems and understanding host-pathogen dynamics.
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