Stenotrophomonas Maltophilia Workup

Updated: Sep 16, 2021
  • Author: Sara Ahmed, MBBS, FCPS, MRCP(UK); Chief Editor: Michael Stuart Bronze, MD  more...
  • Print

Laboratory Studies

Culture of the organism from body fluids and proper identification from the microbiology laboratory confirms the presence of S maltophilia. Usually, the presence of S maltophilia represents colonization. A potential pathogenic role must be evaluated by an infectious disease specialist. The mere recovery of a potential pathogen from any body fluid does not indicate a pathogenic role for the organism.

S maltophilia is an obligate aerobe that grows well on commonly used laboratory media, including blood and MacConkey agars. It is lactose nonfermenting, oxidase-negative, and catalase-positive, DNase positive and can be reliably identified in the laboratory using standard biochemical tests. In addition, it is accurately identified by commercially available automated identification systems. [25]


Histologic Findings

The histology of S maltophilia in the rare situations when it causes infection is indistinguishable from the histology of infections caused by other aerobic gram-negative bacilli.