Outcome of Hepatitis B Virus Infection 100 by Age at Infection 80 80 60 Chi Infecti 40 Chronic Infection(%) 40§ 20 20 Symptomatic Infection 0 Birth 1-6 months 7-12 months 1-4 vears Older Children and adults Age at InfectionSymptomatic Infection Chronic Infection Age at Infection Chronic Infection (%) Symptomatic Infection (%) Birth 1-6 months 7-12 months 1-4 years Older Children and Adults 0 20 40 60 80 100 100 80 60 40 20 0 Outcome of Hepatitis B Virus Infection by Age at Infection Chronic Infection (%)