TLR2 and infection: In this study, we applied the zebrafish larvae to set up a M. avium infectious model and characterized the model through the comparison with the M. marinum infectious model in three different ways: (I) we compared the difference between the M. marinum Mma20 and M. avium MAC 101 infection progression microscopically, (II) we focused on the function of Toll-like receptor 2 signaling after Mma20 and MAC 101 infection and (III) we analyzed the common and specific gene expression profiles resulting from the two infections systems using RNAseq.