Results of IS 900 PCR testing for Mycobacterium avium subsp. paratuberculosis in the patient CD with con oral lesions. The results are consistent with an extensive Mycobacterium avium subsp. paratuberculosis infection. Lanes: 1 and 20 Markers 100 bp; Lane 2: negative control; Lane 19: positive PCR control; Lanes 12 and 13: positive samples.