Los resultados confirmaron la presencia del gen de la toxina shiga sólo en la cepa Tacna410, obteniéndose una identidad del 100% entre la secuencia nucleotídica del gen de la cepa Tacna410 y secuencias reportadas de la toxina shiga de tipo II en el Genebank. Asimismo, se detectó en la cepa Tacna410 propiedades hemolíticas y el gen eae asociado al fenómeno de "attaching and effacing", características de una típica cepa de ECEH.
Palabras clave: Escherichia coli O157/genética; Toxina shiga/genética; Reacción en cadena por polimerasa; Perú
(fuente:BIREME).
SUMMARY
We tried to detect the Shiga toxin gene in local Escherichia coli strains serologically related to the enterohemorrhagic category. At the same time, using polymerase chain reaction (PCR) and sequencing, we characterized a strain confirmed as E. coli O157:H7 serotype, which was isolated in Tacna (a city in southern Peru) (Tacna410 strain). Our results confirmed the presence of the Shiga toxin gene only in E. coli strain Tacna410, and we found 100% identity between the sequence from the amplified gene and reference sequences for Type II Shiga toxin in the gene bank. We also detected in the Tacna410 strain hemolytic properties and the eae gene, which is associated to "attaching and effacing" lesions, typical features of EHEC, strains.
Key words: Escherichia coli O157/genetics; Shiga toxina shiga/genetics; Polymerase chain reaction; Peru
(source: BIREME).
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