Characteristics of subset of Acinetobacter strains.

*Outbreak-associated (+) strain (i.e., common AFLP profile in >2 patients and with same time-space-origin).†Biofilm formation on plastic after 24 h at 28°C. Results are expressed as median optical density values at 590 nm (ranges) of three independent experiments; each performed in sixplicate.‡Adherence to human bronchial epithelial H292 cells after 1 h. Results are expressed as median percentage of H292 cells that is associated with bacteria and median number of bacteria per H292 cells (range) of two independent experiments; each performed in duplicate.¶IL-6 and IL-8 levels in the culture supernatants of H292 cells, 24 h after exposure to bacterial strains. Results are expressed as median values (range) in ng/ml of three independent experiments; each performed in triplicate.