Stenotrophomonas maltophilia

S. maltophilia can be identified with certainty, has well-described virulence factors, is capable of cross-infection and often shows multiresistance. Although CF patients with chronic S. maltophilia infection have lower lung function parameters compared with other CF patients and experience more exacerbations, chronic S. maltophilia infection in itself was not associated with a worse clinical outcome. True, pathogenic effects of S. maltophilia could not be found, but the presence of chronic S. maltophilia could be a marker of more pronounced lung disease in affected patients.