Long term shedding of Salmonella choleraesuis following experimental infection of very young piglets

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1999
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Anderson, R.
Harvey, R.
Genovese, K.
Stanker, L.
DeLoach, J.
Nisbet, D.
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International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork
Iowa State University Conferences and Symposia

The SafePork conference series began in 1996 to bring together international researchers, industry, and government agencies to discuss current Salmonella research and identify research needs pertaining to both pig and pork production. In subsequent years topics of research presented at these conferences expanded to include other chemical and biological hazards to pig and pork production.

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Abstract

In the United States, more than 90% of diagnosed swine salmonellosis cases can be attributed to infections by Salmonella Choleraesuis, the etiologic agent of swine paratyphoid (9). Salmonellosis caused by this serotype is primarily manifested as a post weaning septicentia or enterocolitis and often occurs on operations that comntingle pigs of different ages (9). Salmonella Choleraesuis is rarely isolated from sources other than swine which suggests an important role of carrier swine in the spread of this host adapted pathogen (4-6, 9). Since Salmonella Choleraesuis infections can recur in pigs previously infected, an important role for latent carriers is further implicated (9). The development of a Salmonella Choleraesuis carrier state has been investigated experimentally with weaned piglets (1, 4- 6) but not much is known regarding the potential of neonatal piglets to become long term carriers. This may be because neonatal piglets, while capable of beconting infected, rarely exhibit clinical salmonellosis (9). The objective of the present study was to experimentally infect suckling piglets with Salmonella Choleraesuis and then examine their daily shedding pattern and pattern of tissue colonization well beyond the initial infection period.

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Fri Jan 01 00:00:00 UTC 1999