Journal Article Atlantic salmon Comparative Study Piscirickettsia salmonis Research Support, Non-U.S. Gov't challenge model cohabitation Bacterial Vaccines Case Reports DNA vaccine DNA, Bacterial Piscirickettsiosis Salmoxcellia X-cell parasite calcification emerging disease gallbladder histopathology inflammation intraperitoneal intraperitoneal injection melanization nephrocalcinosis pancreas disease pathology radiology rainbow trout salmonid alphavirus side-effect vaccination