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Clin Microbiol Infect. 2004 Jun;10(6):581-4.

Colistin efficacy in an experimental model of Acinetobacter baumannii endocarditis.

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Service of Emergency and Critical Care, University Hospital Virgen del Rocio, Sevilla, Spain.


The in-vivo activity of colistin was evaluated in an experimental rabbit model of Acinetobacter baumannii endocarditis with a strain susceptible to colistin and intermediate to imipenem. Compared to a control group, colistin was effective (p < 0.05) in bacterial clearance from blood and in the sterilisation of blood cultures, but was not effective in clearing A. baumannii from vegetations. Thus, although colistin may be effective in treating bacteraemia caused by susceptible strains of A. baumannii, it may not be a suitable treatment for endocarditis, perhaps because of poor penetration into vegetations and a low C(max)/MIC ratio in tissue.

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