• J Trauma · May 1981

    Burn sepsis: bacterial interference with Pseudomonas aeruginosa.

    • S M Levenson, D K Gruber, C Gruber, A Watford, and E Seifter.
    • J Trauma. 1981 May 1; 21 (5): 364-71.

    AbstractThe pathogenicity of several strains of Pseudomonas aeruginosa for burned rats (3 degrees scald burns, 20% body surface) following topical application of the bacteria to the burn within 1 hour after burning was established. Following this, it was demonstrated that purposeful infection of such 3 degrees scald burns of rats by a strain of Ps. aeruginosa of low virulence (JB-77) protects the rats from the lethal effect of subsequent (48-hour) topical contamination of the burn by a highly virulent strain of Ps. aeruginosa (VA-134) (p less than 0.001). This finding was confirmed in a similar experiment beginning with germfree rats. When the challenge with the highly virulent Ps. aeruginosa strain was 24 hours (rather than 48 hours) after the burning and topical contamination of the burn with the low virulence strain of Ps. aeruginosa, there was little protection (p N.S.). When burned rats were given the low virulence strain of Ps. aeruginosa by gavage right after burning, there was not protection to subsequent (48 hours) challenge by topical application of the highly virulent strain of Ps. aeruginosa to the burn (11/12 vs 12/12 dying). Our finding that purposeful infection of a 3 degrees burn of rats (conventional and also germfree) by a strain of Ps. aeruginosa of low virulence protects from the lethal effect of subsequent (48-hour) topical contamination of the burn by a highly virulent strain of Ps. aeruginosa is due, we believe, to direct bacterial interference between the two strains of pseudomonas.

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