Hepatitis A virus seroprevalence by age and world region, 1990 and 2005.
OBJECTIVE
To estimate current age-specific rates of immunity to hepatitis A virus (HAV) in world regions by conducting a systematic review and meta-analysis of published data. The estimation of the global burden of hepatitis A and policies for public health control are dependent on an understanding of the changing epidemiology of this viral infection.


METHODS
Age-specific IgG anti-HAV seroprevalence data from more than 500 published articles were pooled and used to fit estimated age-seroprevalence curves in 1990 and 2005 for each of 21 world regions (as defined by the Global Burden of Disease 2010 Study).


RESULTS
High-income regions (Western Europe, Australia, New Zealand, Canada, the United States, Japan, the Republic of Korea, and Singapore) have very low HAV endemicity levels and a high proportion of susceptible adults, low-income regions (sub-Saharan Africa and parts of South Asia) have high endemicity levels and almost no susceptible adolescents and adults, and most middle-income regions have a mix of intermediate and low endemicity levels.


CONCLUSIONS
Anti-HAV prevalence estimates in this analysis suggest that middle-income regions in Asia, Latin America, Eastern Europe, and the Middle East currently have an intermediate or low level of endemicity. The countries in these regions may have an increasing burden of disease from hepatitis A, and may benefit from new or expanded vaccination programs.
Jacobsen
Kathryn H
KH
Department of Global & Community Health, George Mason University, 4400 University Drive MS 5B7, Fairfax, VA 22030, USA. kjacobse@gmu.edu
Wiersma
Steven T
ST
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D014943:Global Health; D006506:Hepatitis A / Q000453:epidemiology*; D035922:Hepatitis A Antibodies / Q000097:blood; D030041:Hepatitis A virus; D006801:Humans; D007223:Infant; D008875:Middle Aged; D016036:Seroepidemiologic Studies; D055815:Young Adult
D035922:Hepatitis A Antibodies