DETEKSI GEN PENYANDI ADHESIN PADA VEROCYTOTOXIGENIC Escherichia coli (VTEC) ISOLAT SAPI (Detection of Gene Encoding Adhesin of Verocytotoxigenic Escherichia coli (VTEC) Isolated from Cattles)

This study was aimed to perform phenotypic and genothypic characterization of Escherichia coli (E. coli), particularly VTEC strain isolated from cattle faeces. In this study, 25 E.coli isolated from faeces specimens and faeces base fertilizer of dairy and beef cattles were used. Examination were carried out using phenotypic and genothypic characterization which is specified for E coli VTEC strain. The result showed that 20 % samples of fresh faeces specimens were detected as VTEC strains and none of isolate was detected from faeces base fertilizer samples. From VTEC strains, could detect 16 % VT1 gene, 12 % VT2 genes and 8% of both. Detection on gene pyelonephritis-associated pilli (pap), S fimbrial adhesion (sfa), and afimbrial adhesion (afa) were found about 60%, 80% and 80%, respectively.

Antimicrobial Resistance Testing of Verocytotoxin-Producing Escherichia coli and First Description of TEM-52 Extended-Spectrum β-Lactamase in Serogroup O26

ABSTRACT We have investigated the antimicrobial resistance of verocytotoxin-producing Escherichia coli (VTEC) strains isolated from humans, animals, food, and the environment in Belgium. Resistance was more frequent in non-O157 strains from humans than in O157 strains from humans or other sources, and among non-O157 VTEC strains, intimin-positive strains were more resistant than intimin-negative strains. We also report the first VTEC strain producing an IncI1 extended-spectrum β-lactamase encoded by plasmid-borne bla TEM-52; this β-lactamase was previously associated with Salmonella enterica and E. coli isolates from different origins.

Evidence for a Hybrid Genomic Island in Verocytotoxin-Producing Escherichia coli CL3 (Serotype O113:H21) Containing Segments of EDL933 (Serotype O157:H7) O Islands 122 and 48

ABSTRACT Genomic O island 122 (OI-122) of the verocytotoxin-producing Escherichia coli (VTEC) strain EDL933 contains four putative virulence genes, Z4321, Z4326, Z4332, and Z4333. However, strain CL3 (serotype O113:H21) contains only Z4321, not the other three genes. To determine whether Z4321 is part of a different genomic island in CL3, a region of 27,293 bp up- and downstream of Z4321 was sequenced and found to contain elements of two different EDL933 genomic islands (OI-48 and OI-122) and a Yersinia pestis-like hemolysin/adhesin gene cluster. The region contained OI-48 genes Z1635, Z1636, and Z1637 at the left terminus and Z1641, Z1642, Z1643, and Z1644 at the right. The middle portion consisted of OI-48 gene Z1640, which was separated into three fragments by genomic segments including the Y. pestis cluster and EDL933 OI-122 genes Z4322, Z4321, and Z4318. In a PCR investigation of 36 VTEC strains of different serotypes, intact Z1640 was present in strains of serotypes O157:H7, O26:H11, O103:H2, O111:NM, and O145:NM, which are associated with hemolytic uremic syndrome and outbreaks. In contrast, fragmented Z1640 was seen in strains of nonepidemic serotypes, such as O91:H21 and O113:H21, and in animal serotypes that have not been associated with human disease, indicating that Z1640 might be a virulence gene.