[The effect of heterophilic antibodies on the result of the passive hemagglutination reaction in intestinal infections].

When commercial erythrocytic diagnostic agents, prepared from sheep red cells, are used in the passive hemagglutination test with blood sera from patients with intestinal infections, the possibility of nonspecific reactions with heterophilic antibodies of human body should be borne in mind. To completely eliminate these antibody effects on the results of the test, titration of the tested serum should be started from 1:64, 1:80, or 1:100, depending on what titration scale is used.