We focused on the responses of two arms of the Atlantic salmon immune system against intracellular pathogens: the antibody (Ab) production by B cells after challenge with the facultative intracellular bacterium <i>Pisciricketsia salmonis</i> and the interferon (IFN) responses in a salmonid cell line against salmon alphavirus (SAV), infectious necrotic pancreas virus (IPNV), and <i>P. salmonis</i>. ...