Number of Immigrants, Estimated HBsAg prevalence, and number of imported chronic hepatitis B cases by country of birth, 1974–2008.

*From United States Department of Homeland Security, for persons obtaining legal permanent residency in United States (www.dhs.gov/files/statistics/publications/yearbook.shtm).**World Health Organization regions. Estimated HBsAg prevalence by region is the weighted average of estimated prevalence for each country in the region.‡Top 10 countries by estimated number of imported chronic hepatitis B cases.