[Hepatitis A in 1997].
Until 1997, hepatitis was registrated in Poland under the headings: hepatitis B and hepatitis non-B. In 1997, for the first time, the obligatory registration of hepatitis A cases was introduced. In the year 1997--4,045 cases of hepatitis A were notified in Poland. The incidence rate was 10.5 per 100,000 population with considerable differences in various voivodships. The incidence rate in rural areas was 2.5 higher than among urban population. The highest incidence rates were registered in the northern and north-eastern parts of the country. The 23% of reported cases occurred among children age 10-14.