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Overall percentages of Salmonella-positive pigs over time after artificial inoculation of 3 of 10 pigs (seven groups) based on bacteriological Salmonella serovar Typhimurium status for inoculated pigs (▴) and tracer pigs (▪) and on the antibody level (ELISA serology) for inoculated pigs (▵) and tracer pigs (□).
