Alam, M. M., S. Z. Zaidi , S. A. Malik , S. Shaukat , A. Naeem , S. Sharif , M. Angez and J. A. Butt. 2007. Molecular epidemiology of Hepatitis B virus genotypes in Pakistan. BMC. Infect. Dis. 7:115.
Arauz, R. P., H. Norder , B. H. Robertson, L. O. Magnius and H. Genotype. 2002. a new Amerindian genotype of hepatitis B virus revealed in Central America. J. Gen. Virology. 83(8): 2059-2073.
Beck, J and M. Nassal. 2007. Hepatitis B virus replication. World J. Gastroenterology. 13(1): 48-64.
Bernard, Weber. 2004. Genetic variability of the S gene of hepatitis B virus. Clinical and diagnostic impact. Journal of Clinical Virology. (32): 102–112.
Bouchard, M. J, and R. J. Schneider. 2004. The enigmatic X gene of hepatitis B virus. Journal of virology. 78(23): 12725-34.
C. T. Yeh. 2010. Development of HBV S gene mutants in chronic hepatitis B patients receiving nucleotide/nucleoside analogue therapy. Antiviral Therapy. 15(3):471-475.
Chisari, F. V and C. Ferrari. 1995. Hepatitis B virus immuno pathogenesis. Annu. Rev. Immunology. 13:29–60.
Dokanehiifard, S and A. Bidmeshkipour. 2009. Study of Hepatitis B Virus (HBV) Genotypes in Kermanshah Province, West of Iran. eJournal of Biological Sciences. 1(1):113-120.
Eftekhari, Y., M. K. Arababadi, H. Hakimi and E. R. Zarandi. 2010. Common HBV Genotype in Southeastern Iranian Patients. Arch. Iran Med. 13(2):147-149.
Guirgis, B. S. S., R. O. Abbas and H. M. E. Azzazy. 2010. Hepatitis B virus genotyping: current methods and clinical implications. International Journal of Infectious Diseases. 941-953.
Gunther, S., L. Fischer, I. Pult, M. Sterneck and H. Will. 1999. Naturally occurring variants of hepatitis B virus. Adv. Virus Res. (52): 125–137.
Hideo, N., S. Hayashi and K. Abe. 2000. Rapid and Specific Genotyping System for Hepatitis B Virus Corresponding to Six Major Genotypes by PCR Using Type-Specific Primers. Journal of Clinical Microbiology. (39): 362–364.
Kaya, A. B and F. Zoulim. 2007. Hepatitis B virus genetic variability and evolution. Virus Research. (127): 164–176.
Khaled, I. A., O. M. Mahmoud, A. F. Saleh and E. A. Baioumi. 2010. Prevalence of HBV Genotypes in Egypt among Hepatitis Patients. Journal of American Science. 6(11): 185-190.
Kim, H.J., J. H. Park, Y. Jee, S. A. Lee, H. Kim, B.C. Song, S.Y. Yang, M. H. Lee, J. H. Yoon, H. J. Kim, H. S. Lee, E. S. Hwang, Y. H. Kook and B. J. Kim. 2008. Hepatitis B virus X mutations occurring naturally associated with clinical severity of liver disease among Korean patients with chronic genotype C infection. J. Med. Virology. (80): 1337–1343.
Klaus, M., B. Weinberger, B. Tanja, B. Stephan and J. Wolfgang. 2000. High genetic variability of the group-specific a-determinant of hepatitis B virus surface antigen (HBsAg) and the corresponding fragment of the viral polymerase in chronic virus carriers lacking detectable HBsAg in serum. Journal of General Virology. (81): 1165–1174.
Lee, W. M. 1997. Hepatitis B virus infection. N. Eng. J. Med. (337): 1733–45.
Locarnini, S and F. Zoulim. 2010. Molecular genetics of HBV infection. Antivir. Ther. (15): 3–14.
Miyakawa. Y and M. Mizokami. 2003. Classifying hepatitis B virus genotypes. Intervirology. (46): 329–338.
Moolla, N., M. Kew and P. Arbuthnot. 2002. Regulatory elements of hepatitis B virus transcription. J. Viral Hepatology. (9): 323–331.
Norder, H., A. M. Courouce and L. O. Magnius. 1992. Molecular basis of hepatitis B virus serotypes variations within the four major subtypes. J. Gen. Virology. (73): 3141–3145.
Norder, H., B. Hammas, S. D. Lee, K. Bile, A. M Courouce and I. K. Mushahwar. 1993. Genetic relatedness of hepatitis B viral strains of diverse geographical origin and natural variations in the primary structure of the surface antigen. J. Gen. Virology. (74): 1341–1348.
Okamoto, H., K. Yano, Y. Nozaki, A. Matsui, H. Miyazaki, K. Yamamoto, F. tsuda, A. Machida and S. Mishiro. 1992. Mutations within the S Gene of Hepatitis B Virus Transmitted from Mothers to Babies Immunized with Hepatitis B Immune Globulin and Vaccine. (32): 264-268.
Okamoto, H., M. Imai, M. Kametani, T. Nakamura and M. Mayumi. 1987. Genomic heterogeneity of hepatitis B virus in a 54-year-old woman who contracted the infection through materno-fetal transmission. Jpn. J. Exp. Med. (57): 231–6.
Schaefer, S. 2005. Hepatitis B virus: significance of genotypes. J. Viral Hepatology. (12): 111–124.
Schaefer, S. 2007. Hepatitis B virus taxonomy and hepatitis B virus genotypes. World J. Gastroenterology. (13): 14–21.
Sloan, R. D., S. Ijaz, P. L. Moore, T. J. Harrison, C. G Teo and R.S Tedder. 2008. Antiviral resistance mutations potentiate hepatitis B virus immune evasion through disruption of its surface antigen a determinant. Antivirology Ther. (13): 439–447.
Stuyver, L., D. S. Gendt, V. C. Geyt, F. Zoulim, M. Fried, R. F. Schinazi and R. Rossau. 2008. A new genotype of hepatitis B virus: complete genome and phylogenetic relatedness. J. Gen. Virology. (81): 67-74.
Summers, J and W. S. Mason. 1982. Replication of the genome of a hepatitis B–like virus by reverse transcription of an RNA intermediate. Cell. (29): 403–15.
Torresi, J., E. L. Silveira, G. Deliyannis, K. Edgtton, H. Zhuang, S. A. Locarnini, J. Fyfe, T. Sozzi and D. C. Jackson. 2002. Virology. (293): 305–313.
Warner, N and S. Locarnini. 2008. The antiviral drug selected hepatitis B virus rtA181T/sW172 mutant has a dominant-negative secretion defect and alters the typical profile of viral rebound. Hepatology. (48): 88 –98.
Whalley, S. A., D. Brown , G. J. Webster , R. Jacobs , S. Reignat , A. Bertoletti , C. G. Teo, V. Emery and G. M. Dusheiko. 2004. Evolution of hepatitis B virus during primary infection in humans: transient generation of cytotoxic T-cell mutants. Gastroenterology. (127): 1131–1138.
Yeh, C. T., R. N. Chien, C. M. Chu and Y. F. Liaw. 2000. Clearance of the original hepatitis B virus YMDD-motif mutants with emergence of distinct lamivudine-resistant mutants during prolonged lamivudine therapy. Hepatology. (31): 1318 –1326.
Zoulim, F and C. Trepo. 1998. Drug therapy for chronic hepatitis B: antiviral efficacy and influence of hepatitis B virus polymerase mutations on the outcome of therapy. J. Hepatology. (29): 151–68.