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(a) Salmonella serovar Typhimurium culture-positive organic pigs found during 6 weeks after inoculation of 3 of 10 pigs with a low dose (paddocks C and D in period 1) or a high dose (paddocks E and F in period 1 and C to E in period 3) of Salmonella serovar Typhimurium cells. (b) Transmission of Salmonella serovar Typhimurium to tracer pigs after introduction into the Salmonella-contaminated environment of paddocks C to F in the second experimental period.
