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Journal of Clinical Microbiology, March 1998, p. 648-651, Vol. 36, No. 3
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Antigenic Diversity of Hepatitis B Virus Strains of Genotype F in Amerindians and Other Population Groups from Venezuela

Linda Blitz,1 Flor H. Pujol,2,* Paul D. Swenson,3 Leticia Porto,1 Ricardo Atencio,1 Mary Araujo,1 Luciana Costa,1 Diana Callejas Monsalve,1 Jaime R. Torres,4 Howard A. Fields,5 Steve Lambert,5 Caroline Van Geyt,6 Helene Norder,7 Lars O. Magnius,7 José M. Echevarría,8 and Lieven Stuyver6

Laboratorio Regional de Referencia Virológica, Instituto de Investigaciones Clínicas, LUZ, Maracaibo,1 Laboratorio de Biología de Virus, CMBC, IVIC,2 and Instituto de Medicina Tropical, UCV,4 Caracas, Venezuela; Seattle-King County Department of Public Health, Seattle, Washington3; Hepatitis Branch, Centers for Disease Control and Prevention, Atlanta, Georgia5; Innogenetics, Ghent, Belgium6; Department of Virology, Swedish Institute for Infectious Disease Control, Stockholm, Sweden7; and Instituto de Salud Carlos III, CNMVIS, Majadahonda, Spain8

Received 11 July 1997/Returned for modification 9 September 1997/Accepted 20 November 1997

The adw4 subtype of hepatitis B virus (HBV) belongs to a unique genomic group (genotype F) representing the original HBV strains from the New World. Data regarding the prevalence of this subtype among HBV carriers in South America are, however, scarce, and those concerning HBV genotype F are based on only a few samples from Latin America. In this study, serum samples were obtained from 141 hepatitis B surface antigen (HBsAg) carriers from Amerindians and urban populations from Venezuela. The HBsAg subtype was identified with monoclonal antibodies in 105 samples, and the HBV genotype was identified by reverse-phase hybridization with DNA fragments in 58 samples. The adw4 subtype was highly prevalent in the population studied (75%); among the Amerindians, the prevalence was 97%. The adw2 subtype was also present (10%), while other subtypes (ayw3 and ayw4) were only occasionally found. The HBV subtype was associated with the expected genotype in most cases (80%), and thus genotype F was highly prevalent. Sequencing of viral strains that gave genotypes unpredicted by the HBsAg subtyping confirmed seven of them as belonging to not previously described genotype-subtype associations: namely, adw2 and ayw4 within genotype F.

* Corresponding author. Mailing address: Laboratorio de Biología de Virus, CMBC, IVIC, Apdo 21827, Caracas 1020-A, Venezuela. Phone: 58.2.5041623. Fax: 58.2.5041623. E-mail: fpujol{at}pasteur.ivic.ve.

Journal of Clinical Microbiology, March 1998, p. 648-651, Vol. 36, No. 3
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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