TABLE 2.

Frequency of tracer pigs testing Salmonella positive based on results by two diagnostic methods

Diagnostic methodNo. positive/total in indicated Salmonella inoculation experimenta
Low doseHigh dose
C-1D-1E-1F-1C-3D-3E-3
Bacteriology2/75/73/77/71/55/63/7
Serologyb1/72/75/77/74/56/64/7
  • a Number of Salmonella-positive pigs (positive in at least one of six samples) out of the total number of tracer pigs in each group is shown, reflecting transmission of Salmonella from artificially infected pigs (low or high dose of Salmonella cells) to tracer pigs in paddocks C to F in periods 1 and 3 (see Table 1).

  • b ELISA method.