Change in the transcription of the gene coding for the UDP-3-O-acyl-N-acetylglucosamine-deacetylase investigated during this study. The relative gene expression profile of the gene coding for UDP-3-O-acyl-N-acetylglucosamine deacetylase was calculated in the spleen, liver and anterior kidney samples of rainbow trout, Oncorhynchus mykiss infected with A. salmonicida sampled 6 and 48 hours post infections. qPCR data were normalized against 16S rRNA expression. Relative gene expression changes were determined by calculating the mean expression values from the control and infected spleen, liver and anterior kidney samples of fish according to the 2-ΔΔCT method. Each value represents the mean of triplicate independent biological samples and error bars indicate the confidence intervals.