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Table 1 Percentage of egg content batches positive for the challenge strain Salmonella Enteritidis S1400/94

From: Prevention of egg contamination by Salmonella Enteritidis after oral vaccination of laying hens with Salmonella Enteritidis ΔtolC and ΔacrABacrEFmdtABC mutants

Group Week 1 Week 2
Non-vaccinated 70a (74)a 0 (17)a
ΔtolC 0b (0)b 0 (0)b
ΔacrABacrEFmdtABC 0b (0)b 0 (0)b
  1. Animals were vaccinated at day one, 6 weeks and 16 weeks of age with 108 cfu of either Salmonella Enteritidis 147 ΔtolC or Salmonella Enteritidis 147 ΔacrABacrEFmdtABC strains or kept as non-immunized controls. Results are shown for egg content samples, plated on BGA after BPW (48 h, 37 °C) incubation. Percentage of batches positive after enrichment in tetrathionate brilliant green broth (37 °C, overnight) are shown between brackets. Different superscripts within a column indicate significant differences between the groups (p < 0.05).