3Mcorist S,Wager A M,Kratzer D,et al. Vet Rec,2000,146:61-64.
4Gebhart C J, McOrist S, Lawson G H K, et al. Specific in situ hybridization of the intracellular organism of porcine prolife ratiye enteropathy. Vet Pathol, 1994,31 : 462 - 467.
5Boye M,Jensen T K, Moiler K, et al. Specific detection of lawsonia intracellrlaris in porcine proliferative enteropathy inferred from fluorescent rRNA in situ hybridization. Vet Pathol, 1998,35 : 153- 156.
6Joens L A, Nibbeline S, Glock R D. Induction of gross and microscopic lesions of poecine prolife ratiye enteritis by Lawsonia intracellaris. AJVR, 1997,58: 1125 - 1131.