Fig. 2

Community-based geographical distribution of M. ulcerans genotypes from the environment and humans. Blue square callouts contain genotypes found only in the environment (water bodies and biofilms); Pink square callouts have genotypes found only in human beings; Genotype E corresponds to M. marinum; Genotype D overlaps between the environment and human populations; blue lines represent water bodies (streams and rivers); Sampled water bodies, biofilms, detritus, and suspected BU patients are represented by colored dots as defined in the legend