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Uptake and persistence of Salmonella serovar Gallinarum 9 (SG9) and SPI-1 (spaS) and SPI-2 (ssaU) mutant strains in the HD11 chicken macrophage-like cell line, determined by gentamicin protection assay. Bacteria were added at an MOI of 10. The results shown are mean (plus standard error of the mean [error bar]) values based on three independent experiments.
