Mosaic structure of the new CRF composed by subtypes B and F1.

<p><b>Breakpoint positions according to HXB2 genome numbering system are indicated</b>. The phylogenetic trees for each of the seven mosaic segments (I-VII) were constructed with Mega software v6.0 and the trees were midpoint rooted. The stability of each node was confirmed by bootstrapping with 1.000 replicates and only significant bootstrap values >70% are shown at the corresponding nodes. The genetic distance corresponding to the length of the branches is shown by the line at the bottom. The red color represents the CRF90_BF1 identified in this study.