Antimicrobial drug resistance genes do not convey a secondary fitness advantage to calf-adapted Escherichia coli

Article Abstract:

A study was conducted on the effect of antimicrobial drug resistance genes on Escherichia coli. It was observed that the greater fitness advantage of anti-microbial-resistant Escherichia coli in calves is in no way affected by the antimicrobial resistance genes, but the farm environment and the diet are clearly responsible for the maintenance of the microbial resistance genes.

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Role of calf-adapted Escherichia coli in maintenance of antimicrobial drug resistance in dairy calves

Article Abstract:

Anti microbial drug-resistant bacteria is normally found more in younger animals and studies were conducted to come to a conclusive decision regarding this occurrence. It was found that the prevalence of resistant organisms was not equally distributed across age groups and it was found that resistant E. coli had higher fitness in the calf enteric environment.

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Multiple environmental stress tests show no common phenotypes shared among contemporary epidemic strains of Salmonella enterica

Article Abstract:

The comparison of phenotypic traits of coexisting epidemic and nonepidemic strains of Salmonella enterica serovars Typhimurium and Newport identified specific upregulated genes during defined stress conditions but no common traits were shared by epidemic serovars.

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