Resumo

MARIANELLA, Moreno et al. Detection of plesiomonas shigelloides by pcr in feral (oreochromis mossambicus) and cultured tilapias (tetrahybrid of o. Mossambicus × o. Urolepis hornorum × o. Niloticus × o. Aureus) in venezuela. Rev. Cient. (Maracaibo) [online]. 2006, vol.16, n.5, pp.459-465. ISSN 0798-2259.

Plesiomonas shigelloides is a Gram negative rod, facultative anaerobic, motile, that belongs to the Enterobacteriaceae. It’s not part of the normal human flora, while fresh water fish like tilapias are thought to be its primary reservoir. Considering: a) The more frequent implication of this microorganism as the causal agent of intra and extraintestinal infections, b) The wide spread of national commercialization of feral and cultured tilapias and c) The need for rapid and effective detection and identification methods, the biomolecular technique of Polymerase Chain Reaction (PCR) was applied. Strains of P. shigelloides and pools of homogenates from spleen, kidney and brain and the intestine of tilapias were processed by PCR, using specific primers for the gene 23S rRNA of P. shigelloides. The 20 strains identified by conventional phenotypic traits were identified in 75%, additionally it was detected in 27% of the fresh homogenates and in 18% of the frozen ones. These results confirm the specificity of the technique for the identification of a diverse range of potential pathogenic bacteria, its usefulness in the improvement of quality control in freshwater farms and in the study of clinical cases, improving the effectiveness of health systems related with these areas

Palavras-chave : Tilapias; identification; Plesiomonas shigelloides; PCR.