High-level genotypic variation and antibiotic sensitivity among Escherichia coli O157 strains isolated from two Scottish beef cattle farms

Article Abstract:

The characterization and population genetics of Escherichia coli O157 in a series of longitudinal studies of cattle on two farms in Scotland is studied in detail and reported. Results showed a high variation among strains of E.coli in just two farms in the same vicinity over a 2-year period. The studies demonstrated resistance of the strains to sulfamethoxazole, chloramphenicol and at a lower rate, other antibiotics, indicating the preservation of antibiotic sensitivity in a rapidly changing population of E.coli O157.

Genotype, Genotypes, Genetic variation

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Age-related decline in carriage of ampicillin-resistant Escherichia coli in young calves

Article Abstract:

Comparison of the carriage of ampicillin-resistant Escherichia coli with age and time in multiple cohorts of calves sampled monthly from birth on four farms is done. The presence of ampicillin-resistant E.coli in older cattle on all farms suggests that in some calves the decline is transient, with cattle reacquiring resistant bacteria at a later point due to environmental changes or management events on the farm.

Cohort analysis, Ampicillin

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Molecular epidemiology of antimicrobial-resistant commensal Escherichia coli strains in a cohort of newborn calves

Article Abstract:

A unique view of the microbial ecology of an antimicrobial-resistant commensal Escherichia coli population within a large cohort of calves monitored intensively from birth is presented. Results reveal that calves are colonized by a succession of multiply resistant strains, with a probable environmental source, that disseminated through the cohort over time.

Livestock, Except Dairy and Poultry, Epidemiology, Calves, Calves (Cattle)

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