Quick Answer

Hepatitis B is not a fully double-stranded DNA virus - its genome is a relaxed circular, partially double-stranded DNA molecule with a single-stranded gap. Hepatitis A and hepatitis C are different viruses, and both store their instructions as single-stranded RNA. So the answer depends on which hepatitis you mean: only hepatitis B is a DNA virus, and even it is only partly double-stranded.

  • Hepatitis B virus carries a partially double-stranded DNA genome, not a fully paired one
  • Hepatitis A and hepatitis C are RNA viruses with single-stranded genomes
  • Hepatitis B copies its DNA through an RNA intermediate using reverse transcriptase
  • That reverse-transcription step is what drugs like tenofovir and entecavir block
  • Genome type does not change spread: A is fecal-oral, B and C are blood or sexual
  • Routine tests identify hepatitis B by surface antigen and viral DNA levels, not by genome shape

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Describing hepatitis B as a DNA virus surprises people who assume all hepatitis viruses work the same way. Its genome is a small circular molecule that is only partly double-stranded - one strand is shorter, leaving a gap that is filled in after the virus enters a liver cell. The virus then copies its DNA into an RNA intermediate and back into DNA again, an unusual trick for a DNA virus. Hepatitis A and hepatitis C take a simpler route, storing their instructions as single-stranded RNA. That difference shapes how each virus is detected, how quickly it mutates, and which treatments can slow it down.

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⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.

Sources & Further Reading

Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.