Distribution of biofilm producing Mycobacterium avium isolates in a dendrogram based on the cluster analysis of the composite dataset of RFLP typing using both IS 1311 and IS 1245 as probes. A total of nine isolates of M. avium subspecies avium and 88 isolates of M. avium subsp. hominissuis isolated in Norway were included. The RFLP dendrogram has been presented elsewhere , but is has presently been combined with additional information regarding hsp65 code and the biofilm forming abilities of the isolates. #1247 represents the identical profiles of nine avian isolates, including #1553 and #1794. Biofilm forming isolates have been highlighted in pink.