Hepatitis B virus vs Hepatitis A, C, D, and E viruses
How to tell Hepatitis B virus and Hepatitis A, C, D, and E viruses apart when a board question makes them look alike.
HBV is DNA with reverse transcriptase and serology staging; HAV/HEV are fecal-oral acute RNA; HCV is chronic bloodborne RNA; HDV requires HBsAg from HBV-positive hosts.
Side by side
Hepatitis B is a partially double-stranded DNA virus with reverse transcriptase, blood/body-fluid transmission, vaccine prevention, chronicity risk, and ability to supply HBsAg for HDV coinfection or superinfection.
HAV and HEV are fecal-oral RNA viruses causing acute hepatitis; HCV is bloodborne RNA virus with high chronicity; HDV is defective RNA virus requiring HBV.
HBV replicates through an RNA intermediate using reverse transcriptase and causes liver injury mainly through immune-mediated hepatocyte damage.
HAV and HEV spread enterically without chronic infection; HCV evades immunity and often persists; HDV uses HBV surface antigen for assembly.
HBsAg, anti-HBc IgM or IgG, HBeAg, anti-HBs, and HBV DNA patterns support hepatitis B staging.
Anti-HAV IgM, anti-HCV with HCV RNA, anti-HDV in HBV infection, or HEV exposure in pregnancy support the other hepatitis viruses.
The trap
All cause hepatitis, so genome, transmission, chronicity, vaccine status, and dependency rules separate them.
The repair move
For hepatitis viruses, first sort transmission and chronicity, then apply genome and dependency clues.
Try a free question
CoreA 28-year-old man has 2 weeks of jaundice, dark urine, and right upper quadrant pain after unprotected sexual exposure 3 months ago. Labs: ALT 1480 U/L, total bilirubin 6.2 mg/dL, HBsAg positive, anti-HBc IgM positive, HBeAg positive. Which feature is unique to hepatitis B virus among the hepatitis viruses?
Show answer and explanation
Answer: A. Partially double-stranded DNA genome replicated via reverse transcriptase. Hepatitis B is unique among hepatitis viruses because it is a partially double-stranded DNA virus that replicates through an RNA pregenomic intermediate using its own reverse transcriptase.
Why the other choices are tempting
- B. Hepatitis A, C, and E are single-stranded positive-sense RNA viruses; this is not unique to HBV.
- C. Hepatitis D (delta agent) is the defective virus, and it requires HBV (not HCV) coinfection to provide HBsAg envelope.
- D. Rotavirus has segmented dsRNA, not a hepatitis virus.
- E. Influenza and rhabdoviruses are negative-sense RNA viruses; no hepatitis virus fits this category.
Flashcards
Tap a card to flip it.
Which hepatitis virus is partially double-stranded DNA?
Hepatitis B virus is partially double-stranded DNA.
Which hepatitis virus requires HBV surface antigen?
Hepatitis D virus requires HBV surface antigen.
Quick answers
What is the fastest way to tell Hepatitis B virus from Hepatitis A, C, D, and E viruses?
HBV is DNA with reverse transcriptase and serology staging; HAV/HEV are fecal-oral acute RNA; HCV is chronic bloodborne RNA; HDV requires HBsAg from HBV-positive hosts.
What is the key clue for Hepatitis B virus?
Hepatitis B is a partially double-stranded DNA virus with reverse transcriptase, blood/body-fluid transmission, vaccine prevention, chronicity risk, and ability to supply HBsAg for HDV coinfection or superinfection.
What is the key clue for Hepatitis A, C, D, and E viruses?
HAV and HEV are fecal-oral RNA viruses causing acute hepatitis; HCV is bloodborne RNA virus with high chronicity; HDV is defective RNA virus requiring HBV.
What is the common trap with Hepatitis B virus vs Hepatitis A, C, D, and E viruses?
All cause hepatitis, so genome, transmission, chronicity, vaccine status, and dependency rules separate them.