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Infect Immun. Jul 1995; 63(7): 2658–2664.
PMCID: PMC173356

Alternate routes of invasion may affect pathogenesis of Salmonella typhimurium in swine.

Abstract

Transmission of Salmonella typhimurium in swine is traditionally believed to occur by the fecal-oral route, with invasion through the intestinal wall and Peyer's patches. However, involvement of the upper respiratory tract may be equally important. An esophagotomy was performed on 6- to 8-week-old pigs. Esophagotomized pigs were challenged intranasally with 10(9) CFU of S. typhimurium cells and necropsied at 3, 6, 12, and 18 h postinoculation (p.i.). By 3 h p.i., S. typhimurium was recovered from cecum, colon, head, and thoracic tissues and from the middle ileum involving a large number of Peyer's patches. The ileocolic lymph nodes and ileocolic junction were not positive for S. typhimurium until 6 and 12 h p.i., respectively. Additional pigs were inoculated transthoracically with 10(9) CFU of S. typhimurium and necropsied at 3 and 18 h p.i. By 3 h p.i., all tissues were positive for S. typhimurium. Tonsil explants seeded with 10(9) CFU of S. typhimurium indicated that within 6 h p.i., S. typhimurium was located within the tonsilar crypts. These data show that after intranasal inoculation, S. typhimurium rapidly appears in the gut tissues and suggest that the tonsils and lung may be important sites for invasion and dissemination of Salmonella species.

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Selected References

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