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Culturable and VBNC Vibrio cholerae: Interactions with Chironomid Egg Masses and Their Bacterial Population

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Abstract

Vibrio cholerae, the etiologic agent of cholera, is autochthonous to various aquatic environments. Recently, it was found that chironomid (nonbiting midges) egg masses serve as a reservoir for the cholera bacterium and that flying chironomid adults are possible windborne carriers of V. cholerae non-O1 non-O139. Chironomids are the most widely distributed insect in freshwater. Females deposit egg masses at the water's edge, and each egg mass contains eggs embedded in a gelatinous matrix. Hemagglutinin/protease, an extracellular enzyme of V. cholerae, was found to degrade chironomid egg masses and to prevent them from hatching. In a yearly survey, chironomid populations and the V. cholerae in their egg masses followed phenological succession and interaction of host–pathogen population dynamics. In this report, it is shown via FISH technique that most of the V. cholerae inhabiting the egg mass are in the viable but nonculturable (VBNC) state. The diversity of culturable bacteria from chironomid egg masses collected from two freshwater habitats was determined. In addition to V. cholerae, representatives of the following genera were isolated: Acinetobacter, Aeromonas, Klebsiella, Shewanella, Pseudomonas, Paracoccus, Exiguobacterium, and unidentified bacteria. Three important human pathogens, Aeromonasveronii, A. caviae, and A. hydrophila, were isolated from chironomid egg masses, indicating that chironomid egg masses may be a natural reservoir for pathogenic Aeromonas species in addition to V. cholerae. All isolates of V. cholerae were capable of degrading chironomid egg masses. This may help explain their host–pathogen relationship with chironomids. In contrast, almost none of the other bacteria that were isolated from the egg masses possessed this ability. Studying the interaction between chironomid egg masses, the bacteria inhabiting them, and V. cholerae could contribute to our understanding of the nature of the V. cholerae–egg mass interactions.

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Acknowledgment

We thank A. Barbul for his technical assistance with the Confocal Fluorescent microscope.

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Authors and Affiliations

  1. Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Ramat Aviv, 69978, Israel

    Malka Halpern & Eugene Rosenberg

  2. Department of Biology, Faculty of Science and Science Education, University of Haifa, Oranim, Tivon, 36006, Israel

    Malka Halpern, Ori Landsberg & Dina Raats

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  1. Malka Halpern
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  2. Ori Landsberg
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  4. Eugene Rosenberg
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Correspondence to Malka Halpern.

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Halpern, M., Landsberg, O., Raats, D. et al. Culturable and VBNC Vibrio cholerae: Interactions with Chironomid Egg Masses and Their Bacterial Population. Microb Ecol 53, 285–293 (2007). https://doi.org/10.1007/s00248-006-9094-0

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  • DOI: https://doi.org/10.1007/s00248-006-9094-0

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