Submitted to: Poultry Science Association Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 1999
Publication Date: August 1, 1999
Citation: Ladely, S.R., Cray, P.J., Bailey, J.S., Stern, N.J. 1999. Colonization of broiler chicks by salmonella typhimurium dt104. Poultry Science Association Meeting Abstract. 78: sUPPL. 1. aBSTRACT 373. p. 84-85. Technical Abstract: Colonization and shedding of DT104 was studied in broiler chickens. Day-of-hatch chicks (n=60 per treatment, n=30 per rep) were challenged with 10E6 CFU DT104 (wild type isolate from poultry), or were commingled with a challenged seeder chick. A control group was not exposed to DT104. At hatch all groups were colonized with naturally occurring S. Senftenberg and S. Mbandaka infections prior to introduction of DT104. Twenty chicks per treatment were necropsied weekly and their cecal contents were cultured. Throughout the study, the level of Salmonella shedding in feces did not differ among groups (means 3.7, 3.5 and 2.8 log10 CFU per g feces for challenged, seeder and control groups respectively). Colonization of DT104 remained constant at high levels in the challenged group (mean 87%), increased over time in the seeder group (10% to 50%, p=.02) and was not recovered from the control chicks. Salmonella Mbandaka colonization remained unchanged in all groups (means equal to 3%, 35% and 33% for challenged, seeder and control groups respectively); while S. Senftenberg colonization levels tended to decline (p=.058) over time in the challenged group (20% to 0), decreased (p<.01) over time for both the seeder (80% to 0) and control chicks (85% to 20%). Introduction of DT104 by commingling with one infected chick may induce colonization resulting in persistent high levels of shedding in flocks simultaneously with other Salmonella spp.