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Vaccination as an Intervention Strategy for Reduction of Escherichia coli O157:H7 during a 45-Day Pre-Conditioning Period


1. Determine baseline prevalence for the proportion of freshly weaned Montana Calves
shedding Escherichia coli O157:H7 in the feces
2. Determine the effectiveness of an experimental vaccine as a pre-harvest intervention strategy
for reducing the proportion of calves shedding Escherichia coli O157:H7 in the feces

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Findings: The baseline prevalence of weaned calves in Montana at 9.4% is enough to perpetuate infection and should be considered a problem. Due to limited number of animals found positive in this study, additional research is needed to establish the potential effectiveness of vaccines against E. coli O157:H7 in pre-conditioning operations.

<P> For complete projects details, view the <a href="…; target="_blank">Project Summary. </a>

Paterson, John
Montana State University
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