Citation: Tk. Graczyk et al., INFECTIVITY OF CRYPTOSPORIDIUM-PARVUM OOCYSTS IS RETAINED UPON INTESTINAL PASSAGE THROUGH A MIGRATORY WATER-FOWL SPECIES (CANADA GOOSE, BRANTA-CANADENSIS), TM & IH. Tropical medicine & international health, 2(4), 1997, pp. 341-347