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Vibrio penaeicida is the causative bacterium of vibriosis in cultured kuruma prawn Penaeus japonicus in Japan. To develop a specific and sensitive method for the detection of the pathogen, a species-specific sequence in the 16s rRNA of V penaeicida was determined and a polymerase chain reaction (PCR)-based method was devised on the basis of the sequence Pnor to sequencing, a part of the variable regions of the 16s rRNA was amplified by using primers designed from 2 conserved regions according to previously reported data on Vibrionaceae. The region of the 16s rRNA (nucleotide numbers 440 to 490 in Escherjchja coli 16s rRNA) obtained by this procedure was found to be species-specific for \/ penae~cida. It was confirmed that PCR and RT (reverse transcription)-PCR amplifications with a sense primer designed from the V penaeicida-specific sequence were both able to differentiate V penaeicida from other prawn-pathogenic vibrios. 16s rRNA-targeted RT-PCR was demonstrated to have 100 times higher sensitivity than 16s rDNA-targeted PCR and 10 fg of total nucleic acids extracted from cultured bacterial cells was sufficient to yield the visible fragment in gel electrophoresis. These results indicate that RT-PCR amplification with this primer is useful for specific and sensitive detection of V penaelcida.

16S rRNA targeted RT-PCR for the detection of Vibrio penaeicida, the pathogen of cultured kuruma prawn Penaeus japonicus