Hepatitis B is a viral disease, being an important cause of liver disease. It is 100 times more infectious than the AIDS virus.
Hepatitis B is transmitted through body fluids contaminated with blood, sexual contact with someone infected with hepatitis, needle sharing by intravenous drug users.
The symptoms of Hepatitis B can be quite vague but include tiredness, nausea, loss of appetite, tenderness in the abdomen and jaundice. Chronic hepatitis B occurs in up to 10% of those infected and can lead to irreversible liver damage and liver cancer.
A complete course of hepatitis B vaccine can provide protection against hepatitis B for up to 5 years.