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Interventions to Reduce Epizootic Pathogenic Bacteria in Swine Cattle


The purpose of the proposed research is to develop and implement gastrointestinal
management strategies that will reduce food-borne pathogen colonization of food-
producing animals, particularly swine and cattle. Specific objectives are to: <OL>
<LI>Identify ecological factors impacting attachment and energy metabolism of
enteropathogens within the gut and determine if the host's hormonal status can be
exploited to develop alternatives to antibiotics that can decrease the competitive
fitness and thus the carriage of zoonotic and enteric pathogens in food animals
Determine if feeding an experimental chlorate product to food-producing animals in
field situations will result in the selective killing of E. coli and Salmonella
<LI>Determine if administration of appropriate amounts of chlorate, competitive exclusion
cultures, nitrocompounds, bacteriophage, or quorum sensing inhibitors can effectively
reduce carriage of zoonotic pathogens, thereby providing producers new
environmentally compatible alternatives to antibiotics <LI> Establish a
quantitative model assessing risks of selective factors impacting antimicrobial
resistance acquisition and persistence. Our proposed research should ultimately
reduce the probability and consequences of acquiring food-borne disease or
antimicrobial resistant microbes.

More information

Basic and applied research will be conducted to elucidate and exploit physiological
characteristics that may limit the attachment, competitiveness, and survivability of
zoonotic pathogens so as to reduce their ability to persist within the
gastrointestinal tract and environment. Research will involve both in vitro and in
vivo experimentation to elucidate mechanistic aspects of pathogen virulence and
colonization and to quantitatively model selective factors impacting the development,
amplification, persistence, and transfer of resistance elements within and between
microbial communities. Opportunities for mitigation will be validated in the field.
In some cases, Cooperative Research and Development will be performed with industry partners to aide in technology transfer.

Poole, Toni; Nisbet, David; Hume, Michael; Harvey, Roger; Genovese, Kenneth; Edrington, Thomas; Callaway, Todd; Beier, Ross; Anderson, Robin
USDA - Agricultural Research Service
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