EN
"Zanil" (3,3', 5,5', 6-pentachloro-2,2'-dihydroxy benzanilide) of I.C.I. production is known to be one of the most safe and effective drugs in the treatment of fascioliasis (2, 3, 1, 4). The aim of the studies undertaken was to examine the usefulness of ’’Zanil” in the control of fluke infection in Poland.