Fig. 1

Phylogenetic trees of HCV (a) genotype 1a and (b) genotype 1b in the ALIVE Cohort, 2005–2016, Baltimore, Maryland, USA. The maximum likelihood trees were inferred using RAxML version 8.2 and participants in clusters (red) differentiated from non-clustered participants (black) using ClusterPicker with a bootstrap threshold of 70% and a genetic distance of 0.04