Epidemiological surveillance represents an important tool for the prevention of hepatitis A. In Italy, the surveillance of hepatitis A is based on the routine notification system of infectious diseases (from 1996 it was replaced by SIMI, Computerised System of Infectious Diseases) and on SEIEVA (Epidemiological Integrated System of Acute Viral Hepatitis). From 1997 to 2000 the two surveillance systems have been compared in Puglia region to evaluate match rate, completeness and sensitivity. A total of 7.018 records from SIMI and 4.413 from SEIEVA have been analyzed. During this period, the 37.0% of cases notified to SIMI match SEIEVA records whereas the 58.8% of cases reported to SEIEVA match cases notified to SIMI. Therefore, the match rate between the two systems was 29.0%. The sensitivity of SIMI and SEIEVA resulted 79.4% and 49.9% respectively. The comparison of the two surveillance systems allowed to recognise problems in local organisation. Therefore, a more adequate training should be supplied to workers involved in the surveillance activities.