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Journal of Virology, December 2007, p. 12758-12765, Vol. 81, No. 23
0022-538X/07/$08.00+0 doi:10.1128/JVI.01145-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Centers for Disease Control and Prevention, Coordinating Center for Infectious Diseases, National Center for Preparedness, Detection, and Control of Infectious Diseases, Atlanta, Georgia,1 Centers for Disease Control and Prevention, Division of Viral Diseases, National Center for Immunizations and Respiratory Diseases, Atlanta, Georgia,2 Victorian Infectious Diseases Reference Laboratory, Melbourne Health, North Melbourne, Victoria, Australia,3 Department of Virology and Immunology, LabPlus, Auckland City Hospital, Auckland, New Zealand4
Received 25 May 2007/ Accepted 13 September 2007
Whole genome phylogenetic analysis in this study resolved a total of five major genotypes among the 22 varicella-zoster virus (VZV) strains or isolates for which complete genomic sequences are available. Consistent with earlier publications we have designated these genotypes European 1 (E1), European 2 (E2), Japanese (J), mosaic 1 (M1), and mosaic 2 (M2). Single nucleotide polymorphism (SNP) analysis performed in a whole-genome alignment revealed that VZV isolates of all five genotypes can be accurately genotyped using SNPs from two amplicons: open reading frame 22 (ORF22) and either ORF21 or ORF50. This modified approach identifies all of the genotypes observed using any of the published genotyping protocols. Of 165 clinical varicella and zoster isolates from Australia and New Zealand typed using this approach, 67 of 127 eastern Australian isolates were E1, 30 were E2, 16 were J, 10 were M1, and 4 were M2; 25 of 38 New Zealand isolates were E1, 8 were E2, and 5 were M1. VZV strain diversity in eastern Australia is thus broader than has been described for any other region, including Europe, Africa, and North America. J strains were far more prevalent than previously observed in countries other than Japan. Two-amplicon typing was in complete accord with genotypes derived using SNP in multiple ORFs (ORFs 1, 21, 22, 38, 50, 54, and 62). Two additional minor genotypes, M3 and M4, could also be resolved using two-amplicon typing.
Published ahead of print on 26 September 2007.
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