Abstract
The presence of lactoferrin at the concentration found in cystic fibrosis (CF) sputum (0.9 g/L) reduced MICs and MBCs of doxycycline for Burkholderia cepacia and Pseudomonas aeruginosa strains. MICs for B. cepacia fell by 32- to 64-fold, from highly resistant to clinically achievable values. Rifampicin MICs for B. cepacia strains were reduced by lactoferrin and for some strains MBCs were reduced. These findings suggest new therapeutic approaches to infections and question the relevance of standard sensitivity tests for CF pathogens. Addition of lactoferrin to media for the routine sensitivity testing of CF isolates might give more relevant results.
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