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Assessment of ΔestA (A), Δaxe (B) and their genetically complemented versions in nasopharyngeal colonization. Each mouse received approximately 5X105 CFU intranasally in 20 ml PBS. Each time point represents a mean of 5 individual CFU/mg of nasopharyngeal tissue. The vertical bars indicate the standard error of mean. ** p<0.01, **** p<0.0001.
