Hepatitis B and hepatitis C both attack the liver, but they are caused by entirely different viruses and differ in how they spread, whether they can be prevented, and how they’re treated. The most important distinctions: hepatitis B has an effective vaccine but no reliable cure, while hepatitis C has no vaccine but can be cured in about 95% of cases with modern antiviral treatment.
Two Different Viruses, Same Target
Hepatitis B is caused by a DNA virus, while hepatitis C is caused by an RNA virus. That distinction matters more than it might seem. DNA viruses are generally more stable, which is one reason scientists were able to develop a highly effective vaccine against hepatitis B decades ago. The hepatitis C virus mutates rapidly, which has made vaccine development extremely difficult. No hepatitis C vaccine exists today.
Both viruses infect liver cells and trigger inflammation. Over time, chronic infection with either virus can lead to scarring of the liver (cirrhosis), liver failure, and liver cancer. But the paths they take to get there, and the options for stopping them, look quite different.
How Each Virus Spreads
Hepatitis B is highly infectious. It spreads through contact with blood, semen, and other body fluids, and it’s concentrated enough in these fluids that even small exposures can transmit it. The three most common routes are childbirth (from mother to baby), sexual contact, and sharing needles or drug injection equipment. Less commonly, it can spread through sharing razors or toothbrushes, needlestick injuries, or contact with open sores on an infected person.
Hepatitis C spreads primarily through blood-to-blood contact. Sharing needles or other injection equipment is the most common route in many countries. Sexual transmission of hepatitis C is possible but far less efficient than with hepatitis B. Mother-to-child transmission also occurs with hepatitis C, though at lower rates than hepatitis B. You cannot get either virus from casual contact like hugging, sharing food, or coughing.
One practical difference: hepatitis B is easily transmitted through sex, making it a significant sexually transmitted infection. Hepatitis C is not commonly spread this way, though the risk increases with certain practices that involve blood exposure.
How Often Infections Become Chronic
When adults catch hepatitis B, most of them (roughly 95%) clear the virus on their own within six months. Their immune systems fight it off, and they develop lifelong immunity. The danger is greatest for babies and young children. Infants infected at birth have about a 90% chance of developing a chronic, lifelong infection, which is why newborn vaccination is so critical.
Hepatitis C works differently. More than half of people who contract it develop a chronic infection. The virus is skilled at evading the immune system, so the body often fails to clear it without treatment. Many people carry hepatitis C for years or even decades without knowing it, because the virus can quietly damage the liver long before symptoms appear.
Globally, about 254 million people live with chronic hepatitis B, compared to nearly 50 million with chronic hepatitis C. Hepatitis B’s larger numbers reflect both its higher infectiousness and the fact that many infections occur at birth in regions without widespread vaccination.
Symptoms and How They Show Up
Both infections can cause the same set of acute symptoms: fatigue, nausea, abdominal pain, dark urine, joint pain, and jaundice (yellowing of the skin and eyes). But many people with either virus experience no symptoms at all during the early phase, which is why both are sometimes called “silent” infections.
Hepatitis B is more likely to cause noticeable acute symptoms in adults. Hepatitis C, on the other hand, often produces no symptoms during the initial infection. This is part of why hepatitis C frequently goes undiagnosed until liver damage has already progressed. If you have risk factors for either virus (injection drug use, unscreened blood transfusions, birth in a region with high prevalence), screening blood tests are the only reliable way to know your status.
Prevention
The hepatitis B vaccine is one of the most effective vaccines available. It’s recommended for all infants, children, and any adults who haven’t been vaccinated. The standard series provides long-lasting protection, and widespread vaccination has dramatically reduced new infections in countries with high coverage.
There is no vaccine for hepatitis C. Prevention relies entirely on reducing exposure: not sharing needles, ensuring medical equipment is properly sterilized, and screening blood supplies. This makes hepatitis C harder to control at a population level, since there’s no way to build immunity before exposure happens.
Treatment: Suppression vs. Cure
This is where the two infections diverge most dramatically. Hepatitis B can be managed but, for most people with chronic infection, not cured. Treatment typically involves antiviral medications taken long-term, sometimes for life, to suppress the virus and prevent liver damage. Stopping treatment can allow the virus to reactivate, so it requires ongoing commitment and monitoring.
Hepatitis C, by contrast, is now curable. Direct-acting antiviral medications, introduced in 2011, cure approximately 95% of cases. Treatment courses typically last 8 to 12 weeks, and once the virus is cleared, it’s gone. This was a genuine revolution in infectious disease. Before these drugs existed, hepatitis C treatment involved months of injections with severe side effects and much lower success rates.
The irony is notable: the virus with a vaccine has no cure, and the virus without a vaccine is almost always curable. This shapes public health strategy for each. Hepatitis B control depends on vaccination and preventing new infections. Hepatitis C control depends on finding people who are already infected, treating them, and breaking chains of transmission.
Long-Term Liver Risks
Both chronic hepatitis B and chronic hepatitis C can cause serious liver disease over time. The progression is generally slow, unfolding over decades. Chronic inflammation gradually produces fibrosis (early scarring), which can advance to cirrhosis (extensive scarring that impairs liver function). Both viruses also increase the risk of liver cancer, even before cirrhosis develops.
With hepatitis B, the risk of liver cancer remains elevated even when the virus is well suppressed with medication, so ongoing surveillance with imaging and blood tests is standard. With hepatitis C, achieving a cure substantially reduces the risk of liver-related complications, though people who already had significant scarring before treatment still need monitoring.
Alcohol use accelerates liver damage from both viruses. Co-infection with both hepatitis B and hepatitis C, or co-infection with HIV, also worsens outcomes and complicates treatment decisions.
Quick Comparison
- Virus type: Hepatitis B is a DNA virus; hepatitis C is an RNA virus.
- Vaccine: Available for hepatitis B; none for hepatitis C.
- Main transmission: Hepatitis B spreads easily through sex, childbirth, and blood; hepatitis C spreads mainly through blood-to-blood contact.
- Chronic infection rate in adults: About 5% for hepatitis B; over 50% for hepatitis C.
- Treatment goal: Hepatitis B is suppressed long-term; hepatitis C is cured in about 95% of cases.
- Global burden: Roughly 254 million chronic hepatitis B cases; nearly 50 million chronic hepatitis C cases.