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[Surveillance of gastroenteritic infections in lower Saxony: results and experiences from a regional public-health project over six years].

In Lower Saxony, a regional public health project on a pathogen-specific surveillance of Enteritis infectiosa was carried out from 1994 to 2000. In a separate reporting procedure thirteen health departments transmitted data on the specific pathogen collected from laboratory reports for a joint analysis. The results were distributed among the participants, providing them with information on the situation and trends in their districts and in addition giving them the possibility to compare their data with those of other districts. The incidence of Enteritis infectiosa was 199 reported cases per 100,000 person years. Salmonella was reported most frequently (51 %; S. enteritidis: 33 %, S. TYPHIMURIUM: 14 %, 111 other serotypes: 4 %), followed by Campylobacter (18 %), Rotavirus (17 %), Yersinia enterocolitica (6 %) and Adenovirus (5 %). The incidences of Salmonella and Yersinia enterocolitica were found to be nearly constant over the project period while the incidences of Campylobacter, Rotavirus and Adenovirus increased. This, however, may be due to intensified diagnostics and better reporting behaviour rather than to a real increase. The incidence rates and their trends differed from other German states. This observation emphasizes the need for a regional analysis of infectious disease surveillance data.