The Use of Formalinized Red Cells in the Serology of Hydatid Disease

Abstract
Formalinized sheep red cells, sensitized with tannic acid and coated with echinococcus antigen, can be substituted for fresh cells in the hemagglutination test. Antigen coated formalinized cells stored at 5oC were stable for 2 weeks, and for 6 months when stored at -70[degree]C. After reconstitution, antigen coated formalinized sheep red cells freeze-dried and stored for 7 months at -20oC were satisfactory for use in the hemagglutination test.

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