Understanding Hepatitis Naming: The Alphabetical Discovery History
Hepatitis viruses are named alphabetically (A, B, C, D, E, G) in order of discovery and characterization, not biological relatedness.
Timeline
- Hepatitis A (HAV): Identified 1973 (enteric, RNA, Picornaviridae)
- Hepatitis B (HBV): Australia antigen discovered 1965; virus visualized 1970 (blood-borne, DNA, Hepadnaviridae)
- Non-A, Non-B hepatitis: Clinical syndrome recognized 1970s
- Hepatitis C (HCV): Cloned 1989 (blood-borne, RNA, Flaviviridae)
- Hepatitis D (HDV): Defective satellite virus requiring HBV; identified 1977
- Hepatitis E (HEV): Identified 1990 (enteric, RNA, Hepeviridae)
- Hepatitis G (HGV/GBV-C): Identified 1995; non-pathogenic, not a true hepatitis virus
Key point: These viruses belong to different families and share only liver tropism. The alphabet reflects scientific history, not taxonomy.
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