Studied were pigs with experimental Trichinella spiralis infection by means of biopsy, the complement-fixation test, the tube precipitation reaction, the double diffusion technique after Ouchterlony, and the microimmunoelectrophoresis after Scheidegger, using an antigen obtained by the method of Tanner and Gregory as modified by the authors. Highest titers established by the c. f. test and the tube precipitation reaction were observed on 30th--60th day after the infection. Complement-fixing antibodies were found up to the end of the third month, and precipitins -- up to the end of the fourth month of the infection. With the use of the double diffusion technique and the immunoelectrophoresis method the precipitation arcs were observed in the 2nd and 3rd month after the infection.
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