Molecular evidence for a bacterium of the family Midichloriaceae (order Rickettsiales) in skin and organs of the rainbow trout Oncorhynchus mykiss (Walbaum) affected by red mark syndrome. Issue 4 (31st March 2015) - Cafiso, A; Sassera, D; Serra, V; Bandi, C; McCarthy, U; Bazzocchi, C