| the shift in prevalence of hepatitis a immunity in flanders, belgium. | the purpose of this study was to obtain data on the prevalence of hepatitis a in flanders, belgium, in order to analyse any change in the epidemiological pattern of hepatitis a virus (hav) in the region, and to determine at which age pre-vaccination testing would be useful. to meet these goals, a sero-epidemiological survey was conducted: 4058 serum samples were collected from a random sample of the general population in 1993-94. the overall age-standardised prevalence was 51.3%. among non-belgi ... | 1998 | 9629763 |