Pseudomonas aeruginosa infection leads to high morbidity and mortality in cystic fibrosis patients. The identification of Ps. aeruginosa-assigned factors is important to eradicate the colonization. We started a pilot study to evaluate the gene expression of Ps. aeruginosa directly from the sputum of infected patients. Preliminary results suggest that beyond the heterogeneity of the Ps. aeruginosa phenotype in sputum, we observe a correlation between the expression of antB and pqsA and a low level of lasB transcripts. This approach could shed some light on the behaviour of Ps. aeruginosa during pulmonary infection and may reveal some important elements for optimizing therapy.
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