Estimated age at midpoint of population immunity to hepatitis A by country

The age at midpoint of population immunity (AMPI) is the youngest age at which one-half of the birth cohort has serologic evidence of prior exposure to hepatitis A virus. As the AMPI increases, the endemicity level of hepatitis A generally decreases.

Reference:

Jacobsen KH. Globalization and the changing epidemiology of hepatitis A virus. Cold Spring Harb Perspect Med 2018; 8:a031716.

Reproduced from: Nelson N, Weng M. Hepatitis A. In: CDC Yellow Book 2024: Health Information for International Travel, Centers for Disease Control and Prevention 2024.

Graphic 69392 Version 7.0

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Estimated age at midpoint of population immunity to hepatitis A by country