TABLE 1.

Study design of Salmonella infection in an organic outdoor pig farming environment

PeriodaNo. of pigs in paddockc:
AbBbCDEF
(1) 2 May-10 June887*7*7†7†
(2) 12 June-21 July8810101010
(3) 23 July-1 Sept875†6†7†8
  • a Three periods that aimed to study (1) transmission of Salmonella from artificially infected pigs to tracer pigs in paddocks C to F, (2) transmission of Salmonella from a contaminated paddock environment to new tracer pigs in paddocks C to F, and (3) repetition of period 2 in paddock F and repetition of period 1 in paddocks C to E.

  • b Salmonella-negative control paddocks and pigs.

  • c *, indicated number of tracer pigs plus three pigs inoculated with 7.4 × 107 Salmonella cells (low dose); †, indicated number of tracer pigs plus three pigs inoculated with 3.2 × 109 Salmonella cells (high dose).