E. coli (Migula) Castellani and Chalmers ATCC® 25922™ (ATCC, USA) and strains 31/1A, 35A, and 51A, obtained from frigate (Fregata magnificens) cloaca, were used in the biological assays. Isolated bacteria were previously classified according to their virulence/resistance phenotypes (Table-1) [7 (link)].
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