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Edwardsiella tarda is an enterobacterial fish pathogen that causes mortality in various fish species worldwide. In this study, we analyzed the intraspecific variability in a collection of E. tarda strains isolated from turbot. To do this we employed 4 polymerase chain reaction (PCR)-based methods: (1) random amplified polymorphic DNA (RAPD), (2) enterobacterial repetitive intergenic consensus-PCR (ERIC-PCR), (3) repetitive extragenic palindromic-PCR (REP-PCR) and (4) BOX-PCR. E. tarda isolates from different hosts were also included for comparison. E. tarda strains from turbot showed high molecular homogeneity when RAPD (primers P3 and P6), ERIC-PCR and BOX-PCR were employed. However, with regard to the REP-PCR and RAPD (primers P4 and P5) techniques, different genetic groups could be established within these isolates using either technique. The 2 RAPD types presented an 85% similarity, while those obtained with REP-PCR showed 74% similarity. Based on the results obtained, although a high genetic homogeneity was found in turbot isolates, the RAPD test (with primers P4 and P5) and REP-PCR were capable of discrimination within these strains, and they are therefore considered the most appropriate typing methods for studies of edwardsiellosis in turbot.

Intraspecific genetic variability of Edwardsiella tarda strains from cultured turbot