"Vaccination for <i>Escherichia coli </i>O157:H7 in Market Ready Feedlo" by Robert E. Peterson, David R. Smith et al.

Animal Science, Department of

 

Date of this Version

January 2005

Comments

Published in 2005 Nebraska Beef Cattle Report. Copyright © 2004 The Board of Regents of the University of Nebraska.

Abstract

A clinical trial was conducted in summer 2003 to evaluate effects of vaccinating feedlot cattle against Type III secretory proteins of enterohemorrhagic Escherichia coli on prevalence of E. coli O157:H7 in feces. Treatments included: 1) no vaccination; 2) vaccinated once at re-implant (day 42); 3) vaccinated upon arrival (day 0) and again at re-implant (day 42); and 4) vaccinated on arrival (day 0), at day 21, and again at re-implant (day 42). Vaccination effectively reduced the proportion of feedlot cattle shedding O157 in the feces, the effect was dose-responsive, and vaccination within a pen conferred protection to unvaccinated pen-mates (herd immunity).

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