Renibacterium salmoninarum (Rs) is a Gram-positive facultative intracellular organism that causes a chronic granulomatous inflammation known as bacterial kidney disease (BKD), affecting both fresh and saltwater salmon fish species worldwide (see review by Wiens [2011]). Rs infection progresses slowly characterized by clinical signs that involve all internal fish organs, but particularly the kidney with the appearance of greyish nodules (Austin & Austin, 2016). This pathogen can spread vertically and horizontally between fish