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Arch Virol. 1996;141(9):1767-73.

Sequence analysis of pre-S/S gene of hepatitis B virus strains of genotypes A, D, and F isolated in Brazil.

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Department of Virology, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil.


The nucleotide sequences of pre-S/S gene of nine hepatitis B virus strains (3 adw2, 3 ayw2, and 3 ayw 3) and of pre-S region of two adw4 isolates from Rio de Janeiro, Brazil, were determined. Phylogenetic analysis allowed to classify these strains into three genotypes, A, D and F, reflecting the diverse origin of the population. However, strains belonging to a same genotype were separated by a short evolutionary distance. The presence of aminoacid mutations into Pre-S region not found in hepatitis B viruses isolated in other parts of the world is described.

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