Bootstrap values, as derived from 100 runs of ML trees built in RAxML 7.0.4 [25], for clades without invading sequences or with a maximum of one invading sequence, and for different levels of resolution, i.e., genogroups, genotypes, variants, and outbreak events and bootstraps values were calculated for different fragment lengths within their optimal genomic region, and for several target regions in commonly applied genotyping protocols (color online)