01192nas a2200157   4500000000100000000000100001008004100002260004400043100001400087700002100101245010500122300001200227490000800239520077300247022001401020       2008                            d  c11/2008bM. & H. Schaper GmbHaHannover1 aH Nathues1 aE große Beilage00aDiagnosis of Lawsonia intracellularis infection in pigs after vaccination or antimicrobial treatment  a404-4090 v1153 aDiagnosis of infection with Lawsonia (L.) intracellularis, the causative agent of porcine proliferative enteropathy, is routinely based on the detection of L. intracellularis in faeces and/or tissue samples by PCR. Furthermore, infection can be determined by the detection of antibodies in serum samples. The aim of this comparative study was to examine whether results from molecular biology and serological testing are influenced by applying live bacteria vaccine Enterisol® Ileitis or antimicrobial treatment to pigs naturally exposed to L. intracellularis. Decreased shedding was detected in tylosin treated pigs only. Thus, the distribution of 345 pigs into groups of 0-, 1- or  amp;#8805; 2-times positive by PCR was significantly influenced by the treatment (P  a0341-6593