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Using the numerical clustering method, 14 dusters (containing three or more strains) among 231 bacterial isolates from St. 1, 17 dusters among 252 isolates from St. 2, 17 dusters among 301 isolates from St. 3, and 15 dusters among 260 isolates from St. 4 were found at the 70% similarity value. The predominant organisms were identified as genera Aeromonas, Vibrio, and AIcalgenes at St. 1, Alcaliaenes at St. 2, Aeromonas, Vibrio, and Morarella-Acinetobacter group at St. 3, and Pseudomonas at St. 4.
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