Pseudomonas aeruginosa PAC1R and its defective mutants (acetone-killed bacteria), Salmonella minnesota Re mutant (acetone-killed bacteria and Re-LPS) and Escherichia coli O14 (acetone-killed bacteria and enterobacterial common antigen, ECA) were studied in a mouse active protection test. Immunized mice were challenged with wild-type P. aeruginosa strains. It was established that P. aeruginosa LPS-defective mutants induced cross-immunity against different Fisher immunotypes of P. aeruginosa. S. minnesota Re-LPS and ECA gave mice protection against P. aeruginosa.
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