Seroprevalence of HAV in the participating countries by birth cohort: (a) Czech Republic, Finland, Germany, England; (b) Belgium, Italy, Malta, Slovakia; (c) Lithuania and Romania. The data in these panels are based on the following age groups: 0–4, 5–9, 10–14, 15–19, 20–24, 25–29, 30–34, 35–39, 40–49, 50–59, and ⩾60 years. The data points represent the median birth year of each group, except for the end points which represent the end point birth year and all those born before that.