Serological typing of Pseudomonas aerugionosa--grouping of serotypes.

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.