The RQ values of lifr, herc6, gzma, mmp19, gda, gvinp1, rtp3, socs1, casp14, dusp7, cldn1, camp, rsad2, ccl, irf1, ifng, ccl4, ripk2, rtp2, tnfsf14, and fcrl5 were positively correlated with the infection level (RQ value of R. salmoninarum expression), whereas il13ra1b, dscam, cdh1, clec4e, marco, and flrt3 showed a significant negative correlation with the infection level. This evidence concerns the gene MMP19 and infection.