Enterotoxin gene profile and molecular epidemiology of Aeromonas species from fish and diverse water sources

Aims This investigation was undertaken to study the prevalence, enterotoxin gene profile and molecular epidemiology of Aeromonads from various sources of water (182) and fish (173). Methods and Results A total of 116 Aeromonas sp. were isolated, of which 48 (26·37%) were from water and 68 (34·62%) w...

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Bibliographic Details
Published in:Journal of applied microbiology 2019-09, Vol.127 (3), p.921-931
Main Authors: Rather, M.A., Willayat, M.M., Wani, S.A., Hussain, S.A., Shah, S.A.
Format: Article
Language:English
Subjects:
Aeromonads
Aeromonas
Aquaculture
Aquatic environment
Drinking water
Economic conditions
Ecosystems
enterotoxin genes
Epidemiology
ERIC‐PCR
Farms
Fish
Fish farms
Fish ponds
Genes
Genotyping
Gills
Health risks
molecular epidemiology
multiplex‐PCR
Polymerase chain reaction
Ponds
prevalence
Public health
Species
Surface water
water
Water circulation
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Summary:Aims This investigation was undertaken to study the prevalence, enterotoxin gene profile and molecular epidemiology of Aeromonads from various sources of water (182) and fish (173). Methods and Results A total of 116 Aeromonas sp. were isolated, of which 48 (26·37%) were from water and 68 (34·62%) were from fish samples collected from retail markets and fish farms. The Aeromonads were recovered from all types of water sources viz. drinking water (13%), surface waters (26%) and fish ponds (69%). The most prevalent species recovered from drinking water was A. hydrophila, from fish ponds it was A. caviae, from surface water sources A. hydrophila and A. caviae were recovered more frequently, and A. hydrophila and A. veronii bv. sobria were isolated predominantly from gills of fish samples. On multiplex PCR analysis for the detection of enterotoxin genes (act, alt, ast), the above mentioned Aeromonas species frequently contained enterotoxin genes, irrespective of their sources. From isolates across all the sources, act (63%) and alt (57%) genes were encountered more frequently than ast (6%). The enterobacterial repetitive intergenic consensus sequences polymerase chain reaction was used for typing of isolates and most of the isolates from water and fish were related, owing to similar ecosystem. Conclusion A wide distribution of enterotoxin genes in Aeromonads from water and fish is a potential public health threat and molecular genotyping can be helpful to study epidemiology of the pathogen. Significance and Impact of the Study A high proportion of isolates recovered from diverse water sources, particularly potable drinking water and fish samples carried one or more enterotoxin genes thereby indicating a potential pathogenic nature of isolates from these sources. The genetic relatedness was detected amongst many isolates recovered from water sources and fish samples indicating circulation of familiar virulent clones in the aquatic environments.
ISSN:1364-5072
1365-2672
DOI:10.1111/jam.14351