PFGE patterns of clinical and environmental isolates of the “M. paraffinicum” pseudo-outbreak. PFGE type 1: lanes 1 and 2, patient B (day 8, and stool day 10); lane 3, patient F (day 79); lanes 4 and 5, patient C (days 11 and 14). PFGE type 2: lane 6, patient C (day 12); lane 8, patient E (day 61); lane 9, patient A (day 3). Mixed PFGE type 1 and type 2: lane 7, patient E (day 58). Lane MW, molecular weight standard.