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Volume 21, Number 3—March 2015
Letter

High Prevalence of Hepatitis Delta Virus among Persons Who Inject Drugs, Vietnam

Naomi Hall, Linh Nguyen Thuy, Trinh Do Thi Diem, Allison Waters, Linda Dunford, Jeff Connell, Michael Carr, William Hall, and Lan Anh Nguyen ThiComments to Author 
Author affiliations: National Virus Reference Laboratory, University College Dublin, Dublin, Ireland (N. Hall, A. Waters, L. Dunford, J. Connell, M. Carr, W. Hall); Laboratory for Molecular Diagnostics, National Institute of Hygiene and Epidemiology, Ha Noi, Vietnam (L.N. Thuy, T.D.T. Diem, L.A.N. Thi)

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Figure

Maximum-likelihood phylogenetic tree of hepatitis delta virus (HDV) genotypes 1 and 2 from Vietnam. A 472-nt fragment (corresponding to nucleotides 802–1,273 from HDV isolate C15; Genbank accession no. KF660600) was used to construct the phylogram. HDV genotyping was done by using amplification and bidirectional sequencing of the R0 region as described by Le Gal et al. (2). Bootstrap resampling was done for 1,000 replicates of the dataset using the neighbor-joining algorithm; values >70% are

Figure. Maximum-likelihood phylogenetic tree of hepatitis delta virus (HDV) genotypes 1 and 2 from Vietnam. A 472-nt fragment (corresponding to nucleotides 802–1,273 from HDV isolate C15; GenBank accession no. KF660600) was used to construct the phylogram. HDV genotyping was done by using amplification and bidirectional sequencing of the R0 region as described by Le Gal et al. (2). Bootstrap resampling was done for 1,000 replicates of the dataset using the neighbor-joining algorithm; values >70% are shown at the nodes. Bold text indicates samples from patients in Vietnam; location, year, and risk group are indicated. Genbank accession numbers are shown in parentheses. Scale indicates substitutions per position. PWID, person who injects drugs; SW, sex worker.

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