Hepatitis B is an infection of the liver caused by the hepatitis B virus (HBV). This infection leads to damage of cells in the liver.
Most babies and very young children, and some older children and adults, who are infected with Hepatitis B do not become ill themselves but they still carry the virus in their body and can infect others. They are known as ‘carriers’.
Hepatitis B is a very infectious virus. It can be pass on through contact with blood or blood products like using a contaminated needle or through sexual contact, especially without using protection like condoms.