The individual faecal shed of Salmonella in pigs following mixing of two seeder pigs with six naive pigs (DT-study). The two seeder pigs in each group were inoculated with 0.65 × 109 cfu of one of four different serovars of Salmonella eight weeks earlier. Demonstration of Salmonella is illustrated by white, whereas grey illustrates that Salmonella was not detected. In the right column the results from analysis of Salmonella in tissue samples taken post mortem are shown. Within brackets the tissue from which Salmonella was isolated are abbreviated as follows: cecum content = cec, colon lymph node = col, colon tissue = cot, tonsil = ton.