Reports about acquired resistance to colistin in different bacteria species are increasing, including E. coli of animal origin, but reports of resistance in wild S. enterica of different serotypes from swine are not found in the literature. Results obtained with one hundred and twenty-six E. coli strains from diseased swine and one hundred and twenty-four S. enterica strains from diseased and c...

The growth recovery of Escherichia coli K-12 and Salmonella enterica serovar Typhimurium relA mutants were compared after nutritional downshifts requiring derepression of the branched-chain amino acid pathways. Because wild-type E. coli K-12 and S. enterica serovar Typhimurium LT2 strains are defective in the expression of the genes encoding the branch point acetohydroxy acid synthetase II (ilv...

The growth recovery of Escherichia coli K-12 and Salmonella enterica serovar Typhimurium DeltarelA mutants were compared after nutritional downshifts requiring derepression of the branched-chain amino acid pathways. Because wild-type E. coli K-12 and S. enterica serovar Typhimurium LT2 strains are defective in the expression of the genes encoding the branch point acetohydroxy acid synthetase II...

The survival of enteric bacteria was measured in bovine feces on pasture. In each season, 11 cow pats were prepared from a mixture of fresh dairy cattle feces and sampled for up to 150 days. Four pats were analyzed for Escherichia coli, fecal streptococci, and enterococci, and four inoculated pats were analyzed for Campylobacter jejuni and Salmonella enterica. Two pats were placed on drainage c...

The iroB gene of Salmonella enterica is absent from the chromosome of the related organism Escherichia coli. We determined the distribution of this gene among 150 bacterial isolates, representing 51 serotypes of different Salmonella species and subspecies and 8 other bacterial species which are frequent contaminants during routine enrichment procedures by Southern hybridization. An iroB-specifi...

Escherichia coli microcin J25 (MccJ25) is a 2107-Da peptide antibiotic whose uptake into E. coli is mediated by the outer-membrane receptor FhuA and the inner membrane proteins TonB, ExbB, ExbD, and SbmA. A survey of the sensitivity of several Salmonella enterica serovars showed that the antibiotic was highly active against some serovars, while S. Typhimurium, S. Derby, and some S. Enteritidis ...

Cattle are the main reservoir for human infection by pathogenic Escherichia coli and Salmonella enterica. To prevent entry of these foodborne pathogens into the human food chain, management factors at the farm level must be identifi ed and controlled. External sources of contamination, such as birds, should be considered as potential sources of transmission over long distances. In this review, ...

The gnd gene, encoding 6-phosphogluconate dehydrogenase (EC 1.1.1.44), was sequenced in 87 strains of 15 species assigned to five nominal genera of the Enterobacteriaceae, including 36 isolates of Salmonella enterica and 32 strains of Escherichia coli. In S. enterica, the effective (realized) rate of recombination of horizontally transferred gnd sequences is only moderately higher than the rate...

ozone is a strong oxidant and a potent disinfecting agent. there are numerous application areas of ozone in food industry. while there are many investigations on the application of ozone in food industry, relatively little information is available on the potential of ozone to reduce microbial populations in fresh-cut fruits and vegetables and the visual quality of lettuce. in this study, ozone ...

Accepted: 11/07/2014 Abstract The study was carried out to standardize a multiplex PCR assay for the simultaneous detection of four common food pathogens such as Listeria monocytogenes, Yersinia enterocolitica, Staphylococcus aureus and Salmonella enterica Typhimurium. Pathogen-specific DNA primers targeting hly A, ail, nuc and stm genes were employed for the identification of L. monocytogenes,...