Hepatitis B is a global health crisis, yet it is almost entirely preventable by vaccination.

Health · Published 29 September 2026 Swipe more like this →

In short: Hepatitis B is a viral liver infection that affects hundreds of millions of people worldwide. While it can lead to fatal complications like cirrhosis and liver cancer, it is also highly preventable. Understanding how this virus spreads and why early vaccination is critical is key to global elimination efforts.

Hepatitis B (HBV) is a viral infection that attacks the liver, manifesting as either an acute, short-term illness or a chronic, lifelong condition. The virus spreads through contact with infected blood and bodily fluids, including semen, vaginal fluids, and saliva. Common transmission routes include mother-to-child birth, unprotected sexual contact, and the sharing of needles or unsterilized sharp instruments. Because many people experience no symptoms during the initial infection, the virus often goes undiagnosed, with only about 27% of those living with chronic HBV aware of their status as of 2024.

The risk of developing chronic hepatitis B is heavily dependent on the age of infection. While fewer than 5% of adults who contract the virus develop chronic disease, approximately 90% of infants infected at birth or in early childhood do. This disparity is why the World Health Organization prioritizes infant vaccination. The HBV vaccine, available since 1982, is remarkably effective, offering nearly 100% protection. Despite this, the global burden remains high, with the WHO estimating 240 million people living with chronic infection in 2024, resulting in 1.1 million deaths that year primarily from cirrhosis and hepatocellular carcinoma.

Eliminating hepatitis B as a public health threat by 2030 remains a major goal. Success depends on universal childhood vaccination, timely birth-dose delivery, and expanded access to testing and antiviral treatments like tenofovir. While regions like the Americas and Europe have surpassed 2030 prevalence targets, other areas, particularly in Africa and the Western Pacific, continue to face significant challenges. For those already chronically infected, management involves regular monitoring to prevent liver damage, as there is currently no known cure for chronic hepatitis B.

Beyond vaccination, prevention strategies focus on harm reduction, such as screening blood donations, practicing safe sex, and avoiding the reuse of needles. Because the virus can be transmitted through minor exposures to infected blood, public health initiatives emphasize the importance of sterile medical and personal care equipment. As global efforts intensify, the focus remains on closing the gap between current infection rates and the 2030 target of 0.1% prevalence among children.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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