[Isolation of antigens from Echinococcus granulousus cysts by gradual membrane filtration]

High molecular fractions were obtained by gradual membrane diafiltration and their antigenic and enzymatic (carboxylesterase) activity were analyzed. Degree of the fractions' homogeneity was determined by high performance liquid chromatography. Active antigenic complexes were discovered in fractions with m. m. over 300.000 and 100.000 = 300.000.