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[Risk of Echinococcus granulosus becoming endemic in Dutch cattle].

Echinococcus granulosus is rare in The Netherlands and most human patients originate from southern Europe and Africa, where E. granulosus is still endemic in sheep, cattle, and pigs. Since the accession of some south-eastern European countries to the European Union, a large number of cattle have been imported from this area, according to national import data. The objective of this study was to determine the risk of re-introduction of E. granulosus in The Netherlands via the import of cattle from these endemic areas. The number of infected imported cattle was determined by correcting the number of imported cattle with the national animal prevalence of E. granulosus in the country of origin. In 2007, the number of imported E. granulosus-infected cattle varied from 0 (Cyprus) to 4,934 (Romania, accounting for 90% of all positive cattle). The likelihood of detecting E. granulosus at slaughter is low--we assumed, based on confirmed cases, that only 10% of infected cattle will be detected during visual inspection at slaughter. In 2007, 542 infected cattle were probably culled in The Netherlands (assuming that cattle younger than 3 months were not infected). Since the lungs and livers of cattle approved for human consumption may be processed into dog food, there is a risk that dogs that eat E. granulosus-containing dog food may become infected and in turn infect humans. On the basis of a model that assumed that only cattle older than 3 months at the moment of importation were a risk, 23 dogs may have been exposed to E. granulosus in 2007. To reduce the risk of importing E. granulosus, measures should be taken, such as declaring the lungs and livers of Romanian cattle unfit for human consumption and banning the use of infected raw lung and liver in dog food.