Prevalence of Chronic HBV Infection <img src=http://ihub.concedere.net/HBV_worldwide_prevalence.JPG> Footnotes pertain to the principal driver of new diagnoses: 2. Neonatal transmission (red). 3. Aging of already-infected adults (yellow). 4. Immigration (brown). Source: <A HREF="http://www.who.int/csr/disease/hepatitis/HepatitisB_whocdscsrlyo2002_2.pdf" target="_blank">http://www.who.int/csr/disease/hepatitis/HepatitisB_whocdscsrlyo2002_2.pdf</A> and Novartis.