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The ovicidal activity of various chemicals against eggs of E. granulosus was evaluated by measuring infectivity to CF(1) mice after exposing the eggs to aqueous solutions of the chemicals for 1 h at room temperature. Significant reductions in infectivity were observed in eggs treated with Lugol's iodine, 0.015% ammonium dodecylbenzenesulfonate, 70% ethanol, or 5% or 10% glutaraldehyde. No cysts developed in 10 mice that received doses of 1 000 eggs treated with 5% glutaraldehyde, and only 1 of 10 mice developed cysts after exposure to eggs treated with 10% glutaraldehyde.