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Cross absorption and agar gel diffusion tests were performed using Homma and Liu standard strains and their antisera to study the antigenic relationships among the strains showing strong cross-agglutination. The results suggested that Homma 0:3 strain was able to produce a sufficiently high-titered antiserum against Liu 0:7 and 0:8, and that Liu 0:13 was identical to Homma 0:12. In the antisera against Liu 0:13 and 0:14 there existed a strong antibody common to both antigens as well as an antibody specific to each antigen. Furthermore, the presence of strong common antigens was demonstrated among Homma 0:2, 0:7, 0:13 and 0:16, and between Homma 0:15 and 0:17.
Cross absorption and agar gel diffusion tests were performed using Homma and Liu standard strains and their antisera to study the antigenic relationships among the strains showing strong cross-agglutination. The results suggested that Homma 0:3 strain was able to produce a sufficiently high-titered antiserum against Liu 0:7 and 0:8, and that Liu 0:13 was identical to Homma 0:12. In the antisera against Liu 0:13 and 0:14 there existed a strong antibody common to both antigens as well as an antibody specific to each antigen. Furthermore, the presence of strong common antigens was demonstrated among Homma 0:2, 0:7, 0:13 and 0:16, and between Homma 0:15 and 0:17.