Serological classification of Pseudomonas cepacia by somatic antigen

Ten samples of antiserum against Pseudomonas cepacia were prepared by the intravenous immunization of rabbits with heat-killed organisms. Ten P. cepacia strains used for immunization were proven unique antigenic strains. Using these antisera, we serogrouped 127 strains of P. cepacia, and 114 strains (89.8%) fell under one of the ten serogroup. The most prevalent serogroup was C (26.8), the second most prevalent being D (18.1%). When we compared our serogroups with the serogroups of Monteil et al. (H. Monteil, C. Richard, and A. Heidt, Med. Mal. Infect. 11:544-547, 1981) and Heidt et al. (A. Heidt, H. Monteil, and C. Richard, J. Clin. Microbiol. 18:738-740, 1983), five out of seven of their serogroups were represented by our antisera.

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