Hepatitis B and C are viruses that infect the liver. Many people carry them for years without symptoms, while the infection slowly damages the liver and can lead to cirrhosis and liver cancer. Together the two viruses cause more than 95% of deaths related to viral hepatitis. WHO estimates that in 2024 about 240 million people were living with chronic hepatitis B and about 47 million with chronic hepatitis C, and that about 1.3 million people died of cirrhosis and liver cancer linked to the two infections. The tools to change this exist: a hepatitis B vaccine that gives nearly complete protection, oral medicines that control hepatitis B, and direct-acting antiviral pills that cure more than 95% of people with hepatitis C.
Hepatitis B is most often passed from mother to child at birth in places where the virus is common, and infection in infancy becomes chronic in about 95% of cases, compared with fewer than 5% of infections acquired as an adult. The WHO African Region accounted for 68% of new chronic hepatitis B infections in 2024, yet only 11% of newborns there received a vaccine dose within 24 hours of birth in 2025. Hepatitis C spreads mainly through blood, through unsafe injections and procedures in health care, unscreened transfusions and shared injecting equipment; people who inject drugs account for about 44% of new infections. Most people living with either virus have not been diagnosed, and fewer than 5% of people with chronic hepatitis B were receiving treatment in 2024.