WHO estimates that in 2015, 257 million people were living with chronic hepatitis B virus (HBV) infection worldwide, and that 900 000 died from HBV infection, mostly through the development of cirrhosis and hepatocellular carcinoma. Worldwide, the majority of persons with chronic hepatitis B infection and associated deaths in adulthood acquired their infection at birth through mother-to-child perinatal transmission or in early childhood.