Longitudinal study of Escherichia coli O157:H7 dissemination on four dairy farms in Wisconsin

Article Abstract:

A longitudinal study of Escherichia coli O157:H7 dissemination on four dairy farms in Wisconsin was conducted. The objective of the study was to provide information on the age of first infection, the levels and length of shedding, maintenance and dissemination in cattle and vehicles and farm management practices affecting E coli O157:H7 incidence in a herd. Results indicate that contaminated animal drinking water was the most probable vehicle and provides a potential intervention target for the control of the pathogen on farms.

Drinking water, Contamination

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Field trial evaluating the influence of prophylactic and therapeutic antimicrobial administration on antimicrobial resistance of fecal Escherichia coli in dairy calves

Article Abstract:

The influence of in-feed and therapeutic antimicrobials on resistance in commensal fecal Escherichia coli isolated from preweaned calves is studied. In-feed microbials are associated with higher levels of multiple antimicrobial resistance in fecal Escherichia coli.f and in calves not receiving in-feed antimicrobials, older calves has higher levels of resistance compared to day old calves and individual antimicrobial therapy increased resistance in these calves but appeared to be transient.

Health aspects, Drug resistance in microorganisms, Microbial drug resistance, Escherichia coli

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Effect of sand and sawdust bedding materials on the fecal prevalence of Escherichia coli O157:H7 in dairy cows

Article Abstract:

The potential role of livestock bedding in the ecology and epidemiology of Escherichia coli O157:H7 on farms was ascertained by determining the survival of this pathogen in used-sand and used sawdust dairy cow bedding. The use of sawdust for bedding material for lactating dairy cows, as opposed to sand, was associated with a significantly higher fecal prevalence of Escherichia coli O157:H7.

Epidemiology

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