Fig. 1From: Dried blood spot is the feasible matrix for detection of some but not all hepatitis B virus markers of infectionPhylogenetic tree of engineered dried blood spots (DBS, hollow bullets) and corresponding plasma (colored bullets); sequences without a bullet represent reference. Hepatitis B virus (HBV) DNA sequences of 15 samples are all concordant between DBS and corresponding plasma and are determined to be genotype ABack to article page