hep B affect how much world population?
Many people chronically in-fected with hepatitis B virus do not know they are infected. Most cases of chronic hepatitis B virus in-fection in the United States are found in immigrants or refugees from Asia, Africa, the Pacific Islands, and Eastern Europe.hat are the symptoms of hepatitis B? About 7 out of 10 adults who become infected with hepatitis B develop symptoms. Children under age 5 years rarely have symptoms. When people have symptoms, they usually appear between 60 and 150 days after onset of infection.