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Antibodies against Echinococcus multilocularis metacestodes were screened by immunoblotting sera from patients with alveolar echinococcosis (n = 39), cystic echinococcosis (n = 109), or other parasitic infections (n = 66) and healthy individuals (n = 32). Two antigens, approximately 70 and 90 kDa, are found to be valuable for confirmatory diagnosis, with a sensitivity and specificity of 100 and 99.51%, respectively.