Retrospective clinicopathological and microbiological study of 23 cases of mycobacteriosis in ferrets, in which it targets most commonly the gastroduodenal (pyloric) area, although other presentations such as conjunctival infection are possible; this study, written by Neus Morera at Clínica Exòtics (Barcelona), is being performed in collaboration mostly with Neiker Tecnalia and Northwest ZooPath.