Chronic Hepatitis B develops when the Hepatitis B virus enters your bloodstream and your immune system cannot eliminate it. The virus spreads through contact with infected blood or body fluids. Common ways people get infected include birth from an infected mother, unprotected sexual contact, sharing needles, and accidental needle sticks in healthcare settings. The virus does not spread through casual contact like hugging, sharing food, or coughing.
Your risk is higher if you were born in areas where Hepatitis B is common, including parts of Asia, Africa, and the Pacific Islands. Other risk factors include having multiple sexual partners, living with someone who has Hepatitis B, using injection drugs, working in healthcare, receiving dialysis, or having HIV. People infected as babies or young children are much more likely to develop chronic infection compared to adults. About 90% of infected infants become chronically infected, while only 5% of infected adults do.