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FIGURE 1—— Genetic relatedness of hepatitis B virus (HBV) DNA from infected inmates: phylogenetic distribution derived from 145-base-pair segment from the surface antigen region.

Note. Samples designated with prefix "1" were collected during the baseline serological survey in June 2000; those with prefix "2" were collected during June 2001. The horizontal line at bottom left represents 1% nucleotide substitution for that horizontal branch length. HBV genotype reference strains were obtained from GenBank (accession numbers AJ309369 for genotype A, AY167098 for genotype B, and AB033558 for genotype D).

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