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. 1992 Nov;60(11):4768–4776. doi: 10.1128/iai.60.11.4768-4776.1992

A murine model of chronic mucosal colonization by Pseudomonas aeruginosa.

G B Pier 1, G Meluleni 1, E Neuger 1
PMCID: PMC258230  PMID: 1398987

Abstract

Chronic mucosal colonization by Pseudomonas aeruginosa is an integral part of the pathologic process associated with disease due to infection with this organism. We have adapted the streptomycin-treated murine model of chronic mucosal colonization by enteric pathogens to study colonization by P. aeruginosa. Mice first received 1 mg of streptomycin per ml of drinking water for 2 to 5 days and then ingested 10(7) CFU of P. aeruginosa per ml of drinking water for a minimum of 5 days. The result of this regimen was chronic mucosal colonization with P. aeruginosa for up to 10 weeks, which was determined by fecal cultures and confirmed by culture of the intestines after killing of the experimental animals. Bacterial counts were highest in the cecum and colon, with some evidence for extraintestinal bacterial translocation as well. Use of P. aeruginosa mutants deficient in the production of colonization factors such as pili and those dependent on the rpoN gene product resulted in a lower level of chronic colonization. Immune responses to type-specific lipopolysaccharide, pili, and flagellar antigens were measured, and increases in both serum and intestinal antibodies were usually elicited when a strain elaborated a given antigen. This model represents an easy method of routinely achieving chronic mucosal colonization by P. aeruginosa and should prove useful for the study of both bacterial virulence factors and host responses associated with this infectious process.

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Selected References

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