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Horizontal Transmission of Salmonella typhimurium in Broiler Chicks

U. S. Department of Agriculture, Agricultural Research Service, Food Animal Protection Research Laboratory, 2881 F&B Road, College Station, TX 77845; Phone: (409) 260-9331; FAX: (409) 260-9332

Correspondence: J. A. Byrd

Broiler breeder flocks and hatcheries have been identified as reservoirs of salmonellae and potential sources of Salmonella infection for highly susceptible day-old chicks. Once salmonellae have colonized the gastrointestinal tract of the chick, the bacteria replicate and are shed into the environment to contaminate it and to colonize other chicks. Salmonella will continue to cycle throughout the broiler flock via bird to bird contact, and any facilities that have house the flock will become a potential reservoir for future flocks. The present studies were conducted to evaluate horizontal transmission of Salmonella typhimurium from challenged chicks (seeders) to non-challenged broiler chicks (contacts). Data from the present study suggest that the spread of Salmonella from seeder chicks to contact chicks is dependent on the Salmonella challenge dose and not the number of chicks originally exposed. Horizontal transmission of Salmonella to unchallenged contact chicks from seeders initially challenged with 100 Salmonella or more will limit the effectiveness of any post-hatchery Salmonella control program after they leave the hatchery.

Key Words: Broiler • chick • hatchery • Salmonella • transmission

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				T. R. Callaway, T. S. Edrington, R. C. Anderson, J. A. Byrd, and D. J. Nisbet Gastrointestinal microbial ecology and the safety of our food supply as related to Salmonella J Anim Sci, April 1, 2008; 86(14_suppl): E163 - E172. [Abstract] [Full Text] [PDF]