[Exensivity of invasion Fasciola hepatica L. in cattle in the period 1957-1998 and valuation of losses caused by staggers disease among cattle in Poland, 1995-1997].

On the background of informations about frequency of appearance Fasciola hepatica L. among cattle in Poland in the time from 1995-1997, as well es in the former period, there is presented in the article an estimative apperiation of economical losses caused by staggers disease among cattle. The highest extensiveness of invasion of F. hepatica L. among cattle was noticed in the fifties and sixties manty in the north-eastern Poland. Losses caused by confiscation of a liver to amounted to 1 197 031 zł in 1995, 1 277 154 zł in 1996 and 1 312 078 zł in 1997.