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Biodiversity of chloramphenicol-resistant mesophilic heterotrophs from Southeast Asian aquaculture environments

Huys, Geert and Bartie, Kerry and Cnockaert, Margo and Hoang Oanh, Dang Thi and Phuong, Nguyen Thanh and Somsiri, Temdoung and Chinabut, Supranee and Md Yusoff, Fatimah and Shariff, Mohamed and Giacomini, Mauro and Teale, Alan and Swings, Jean (2007) Biodiversity of chloramphenicol-resistant mesophilic heterotrophs from Southeast Asian aquaculture environments. Research in Microbiology, 158 (3). pp. 228-235. ISSN 0923-2508

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In the present study, samples of pond water, sediment and farmed species were collected at 12 fish and shrimp farms in Malaysia, Thailand and Vietnam to determine the biodiversity and environmental distribution of chloramphenicol-resistant (CmR) mesophilic heterotrophs in Southeast Asian aquaculture sites. Following isolation on Iso-Sensitest agar supplemented with 35 μg ml−1 Cm and dereplication using (GTG)5-PCR fingerprinting, 557 genotypically unique CmR strains were subjected to polyphasic identification. The 557 mesophilic heterotrophic CmR isolates represented 18 different genera largely dominated by the genera Escherichia (40.2%), Pseudomonas (11.7%), Acinetobacter (11.1%), Klebsiella (7.5%) and Bacillus (5.9%). A total of 439 CmR isolates were further assigned to 31 described species or species groups, mainly including organisms that have been associated with various human opportunistic infections such as Escherichia coli (n = 219), Pseudomonas putida (n = 47), Klebsiella pneumoniae (n = 38) and Acinetobacter baumannii (n = 23). Strains of Escherichia, and most notably, of E. coli, were the only common group of CmR heterotrophs irrespective of country, sample type or farm type. Together with other predominant but less widespread groups such as acinetobacters and pseudomonads, the results of this biodiversity study suggest that E. coli can be regarded as a potential indicator of Cm resistance in Southeast Asian aquaculture environments.

Item Type:Article
Keyword:Taxonomy, Antibiotic resistance, Human opportunists
Faculty or Institute:Faculty of Science
DOI Number:10.1016/j.resmic.2006.12.011
ID Code:7282
Deposited By: Najwani Amir Sariffudin
Deposited On:15 Jun 2010 16:39
Last Modified:17 Sep 2015 11:41

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