Abstract
Alcaligenes xylosoxidans, formerly known as Achromobacter xylosoxidans is a nonfermenting gram-negative rod, that is increasingly been identified as a pathogen in the last decade. Nowadays the name commonly accepted for correct taxonomy is Achromobacter xylosoxidans1 . It has been isolated from several aqueous environmental sources, some of which have been associated with nosocomial outbreaks of infections2 . Infections caused by Alcaligenes xylosoxidans have been documented in patients with a variety of indwelling devices, but it has been shown as a causing disease bacteria in other cases without risk factors (previous surgery or catheter carrier). It could be also encountered in all kind of organs and body systems, so this microorganism is acquiring major importance in recent years.