G. Marchetti, M. Ricchi, A. Serraino, F. Giacometti, E. Bonfante, and N. Arrigoni, “Prevalence of Mycobacterium avium subsp. paratuberculosis in milk and dairy cattle in Southern Italy: preliminary results”, Ital J Food Safety, vol. 2, no. 3, p. e35, Oct. 2013.