The abovementioned viruses belong to Polyomaviridae, Papillomaviridae, Herpesviridae, Hepadnaviridae
, Flaviviridae families and represent the research subject for many authors, mainly regarding their life-cycle into the host cell and the risk factors which lead to tumor transformation .
Hepatitis B virus (HBV) is an enveloped 42 nm diameter DNA virus, of the Hepadnaviridae
family, containing a partially double-stranded relaxed circular DNA genome of 3 200 base pairs in length.
The hepatitis B virus (HBV) is a small DNA virus belonging to the Hepadnaviridae
family, genus Orthohepadnavims.
Taxonomically, HBV belongs to the Hepadnaviridae
family and presents a partial double strand DNA genome of approximately 3200 base pairs.
HBV is classified under the family of Hepadnaviridae
. The partially double-stranded DNA genome of the virus contains four overlapping open reading frames (ORF), namely, the polymerase, surface, core, and X genes.
Hepatitis B virus (HBV) is a small partially doublestranded circular Deoxyribonucleic acid (DNA) virus that belongs to the family Hepadnaviridae
. The infectious HBV virion has a spherical, double-shelled structure of about 42 nm in diameter, consisting of a lipid envelope containing Hepatitis B surface antigen (HBsAg).
Hepatitis B virus (HBV) belongs to the family Hepadnaviridae
, members of which constitute 2 major extant genera: Orthohepadnavirus, which infect mammals, and Avihepadnavirus, which infect birds (7).
 Hepatitis B infection is caused by Hepatitis B virus, which is a DNA virus belonging to the family Hepadnaviridae
, which can cause acute or chronic infection.
Hepatitis B virus (HBV) belongs to the Hepadnaviridae
Hepatitis B virus is a double stranded deoxyribonucleic acid (DNA) virus belonging to hepadnaviridae
The virus belongs to family hepadnaviridae
and its genome consists of 3.2 kb double stranded circular DNA molecule (Ganem and Schnieder, 2001).
Among the blood transmissible diseases, Hep B and Hep C (both caused by viruses of the family Hepadnaviridae
), HIV, and syphilis (caused by Treponemapallidum subsp.