Andrés-Lasheras, S. Bolea, R. Mainar-Jaime, R. C. Kuijper, E. Sevilla, E. Martín-Burriel, I. Chirino-Trejo, M. Presence of Clostridium difficile in pig faecal samples and wild animal species associated with pig farms J. appl. microbiol. 10.1111/jam.13343 2017 2017