Environmental Acquisition and Control of Stenotrophomonas maltophilia

Sources of Acquisition

Stenotrophomonas maltophilia is primarily acquired from environmental water sources and hospital water systems, with the organism found ubiquitously in sink drains, faucets, and any surfaces that contact water. 1, 2
Environmental sampling in healthcare facilities should include surfaces that have contacted colonized or infected patients—such as mattresses, bedside tables, chairs, washbasins, and window sills—to detect potential reservoirs. 1, 2

Respiratory equipment and endoscopes require dedicated disinfection protocols because they act as important transmission vehicles for S. maltophilia. 1, 3
Non‑critical patient‑care equipment should be assigned to a single patient or patient cohort to prevent cross‑contamination of S. maltophilia. 1, 3

Moderate‑strength evidence supports routine environmental screening of surfaces that have been in contact with colonized or infected patients to identify contamination. 1, 2
Ongoing monitoring of hospital water distribution systems and high‑touch surfaces is necessary to track contamination patterns and guide interventions. 1, 3

Enhanced environmental cleaning programs that incorporate audit and feedback are conditionally recommended to reduce S. maltophilia transmission. 1, 3
Disinfection protocols must clearly specify (a) which items require cleaning, (b) the disinfectants to be used, and (c) the frequency of disinfection to ensure consistent practice. 1, 3
When standard transmission control measures fail, temporary ward closure for intensive cleaning should be considered as a containment strategy. 1, 2

Water‑contact surfaces such as mattresses, bedside tables, chairs, washbasins, and window sills act as important reservoirs for S. maltophilia when they have been exposed to colonized or infected patients, facilitating indirect transmission within healthcare facilities. 4

Healthcare workers can become vectors for S. maltophilia transmission when hand hygiene and contact precautions are not consistently performed after contact with contaminated surfaces or colonized patients. 5
Wearing gloves and gowns for every patient encounter, removing them promptly after care, and performing immediate hand hygiene are essential practices to prevent healthcare‑worker‑mediated spread of S. maltophilia. 5