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Human 0 erythrocytes, treated with 1% formalin and subsequently exposed simultaneously to hydatid protein antigen and 0.1% chromic chloride, acquire the property of agglutinating on a slide when brought in coontact with specific antiserum. This constitutes the basis of the slide haemagglutination test, an easy, quick, sensitive, and specific procedure, usefull in the diagnosis of hydatid disease.
Straus et al. (Sat,) studied this question.