Dubey J P, Murrell K D, Hanbury R D, Anderson W R, Doby P B, Miller H O
J Am Vet Med Assoc. 1986 Jul 1;189(1):55-6.
A farm in Illinois had swine with enzootic Toxoplasma gondii infections. Ninety-five of 99 pigs had antibody against T gondii by the modified agglutination test; modified agglutination test titers were less than 1:10 (4 pigs), 1:10 (15 pigs), 1:20 (12 pigs), 1:40 (10 pigs), 1:80 (20 pigs), 1:160 (11 pigs), 1:320 (12 pigs), 1:640 (9 pigs), and greater than or equal to 1:1,280 (6 pigs). To trace the route of infection, Toxoplasma-free pigs were introduced into the farm and were evaluated serologically at various intervals. Analysis of data derived from these tracer pigs indicated that cannibalism was a major source of T gondii infection in the pigs.
伊利诺伊州的一个农场里的猪感染了地方性弓形虫。通过改良凝集试验，99头猪中有95头具有抗弓形虫抗体；改良凝集试验的滴度分别为小于1:10（4头猪）、1:10（15头猪）、1:20（12头猪）、1:40（10头猪）、1:80（20头猪）、1:160（11头猪）、1:320（12头猪）、1:640（9头猪）以及大于或等于1:1280（6头猪）。为了追踪感染途径，将无弓形虫的猪引入该农场，并在不同时间间隔进行血清学评估。对这些追踪猪的数据进行分析表明，同类相食是猪感染弓形虫的主要来源。
