The concentration of total IgY and specific anti H. pylori IgY was analyzed by ELISA. The content of IgY in the WSF of egg yolk was investigated for chicken and duck egg yolk. The
average content of total IgY in chicken yolk was 180 ± 12mg and ducks yolk 160 ± 13, which
was 28 ± 4 and 20 ± 4 purity of the chicken and duck egg yolk. After condensation by ultra
filtration, the chicken and duck egg yolk was 140±18 and 130 ± 17 mg and purity of the duck
yolk 29 ± 2 and chicken yolk was 32 ± 4 % on the purity of the total IgY.