By means of physical and chemical procedures seven antigenic fractions have been isolated from Triclzinella spiralis larvae, a s determined by complement fisation. Some evidence is presented t o indicate that at least some of the isolated fractions are antigenically distinct and that antibodies in Triclzinella-infested rabbit develop a t different times for different fractions. Importance of using a properly selected antigen in serodiagnosis of trichinosis is discussed.'Manuscript
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