BLOCK 7 PBL 7– Hepatitis B Infection
Biological
1. Virulence factor of Hepatitis B virus
Morphology 1. Double-shelled spheres
2. Tubular structures
3. Smaller spherical structures
Open reading frames Surface proteins (S ORF)- encodes HBsAg
(ORFs) Core proteins (C ORF)- encodes HBcAg
Polymerase (P ORF)- encodes multifunctional polymerase
Hepatitis X protein (X ORF)- encode HBxAg
2. Classification of hepatitis virus
Virus Virus Viral Mode of Incubation Chronic Comments
classification genome infection period Hepatitis
Hepatitis A Hepatovirus ssRNA Fecal-oral 2-4 weeks No No carrier state
(HAV)
Hepatitis B Hepadnavirus dsDNA Blood-borne 6 weeks – Yes. Carriage associated with liver
(HBV) Sexual 6 months cancer
Hepatitis C Flavivirus ssRNA Blood-borne 2 months Yes Carriage associated with liver
(HCV) cancer
Hepatitis D Deltavirus ssRNA Blood-borne 2-12 weeks Yes Needs concurrent/ superinfect HBV
(HDV) infection
Hepatitis E Hepevirus ssRNA Fecal-oral 3-8 weeks No No carrier state
(HEV) Common in Far East
WEE 55484
, BLOCK 7 PBL 7– Hepatitis B Infection
3. Bilirubin metabolism
WEE 55484
Biological
1. Virulence factor of Hepatitis B virus
Morphology 1. Double-shelled spheres
2. Tubular structures
3. Smaller spherical structures
Open reading frames Surface proteins (S ORF)- encodes HBsAg
(ORFs) Core proteins (C ORF)- encodes HBcAg
Polymerase (P ORF)- encodes multifunctional polymerase
Hepatitis X protein (X ORF)- encode HBxAg
2. Classification of hepatitis virus
Virus Virus Viral Mode of Incubation Chronic Comments
classification genome infection period Hepatitis
Hepatitis A Hepatovirus ssRNA Fecal-oral 2-4 weeks No No carrier state
(HAV)
Hepatitis B Hepadnavirus dsDNA Blood-borne 6 weeks – Yes. Carriage associated with liver
(HBV) Sexual 6 months cancer
Hepatitis C Flavivirus ssRNA Blood-borne 2 months Yes Carriage associated with liver
(HCV) cancer
Hepatitis D Deltavirus ssRNA Blood-borne 2-12 weeks Yes Needs concurrent/ superinfect HBV
(HDV) infection
Hepatitis E Hepevirus ssRNA Fecal-oral 3-8 weeks No No carrier state
(HEV) Common in Far East
WEE 55484
, BLOCK 7 PBL 7– Hepatitis B Infection
3. Bilirubin metabolism
WEE 55484