Bathroom contamination by antibiotic-resistant Enterobacterales (ESBLPE and CPE): an experimental study

• Published in: The Journal of hospital infection 2020-10, Vol.106 (2), p.271-276
• Main Authors: Sevin, T., Goldstein, V., Lolom, I., Lenne, F., Gaudonnet, Y., Baptiste, A.L., Bendjelloul, G., Armand-Lefevre, L., Lucet, J.C.
• Format: Article
• Language: English
• Subjects: Bathroom; CPE; Enterobacterales; Environmental contamination; ESBLPE; Urine
• ISSN: 0195-6701; 1532-2939
• DOI: 10.1016/j.jhin.2020.07.033

Extended-spectrum β-lactamase-producing Enterobacterales (ESBLPE) and carbapenemase-producing Enterobacterales (CPE) cause serious infections. Their presence in urine may lead to environmental contamination potentially responsible for cross-transmission. To evaluate the level of spraying and contamination after emptying urine in the toilet and rinsing in the sink, a common practice in the healthcare setting. For each test, the procedure was similar: seat raised, emptying urinal bottle into the toilet at the height of the bowl, rinsing in the sink and flushing. To study splash-drops, water and fluorescein were mixed in the urinal bottle. In each area, the splash-drops frequency and level were assessed with UV. To study contamination, three ESBLPE and one CPE were diluted in saline, 106/mL. Contamination was assessed by sampling before, immediately after and 3 h after the test. The swabs were cultured and the colonies counted and identified. The areas at the highest risk of spraying were the toilet bowl contour (N = 36/36), the underside of the toilet seat (N = 34) and the inside of the sink (N = 34). Except for gloves (N = 14), there was low clothing contamination. The most frequently contaminated areas were inside the sink (40/48), where the highest levels of contamination were found (14/48). Emptying the urinal bottles in the toilet followed by sink rinsing is associated with a significant risk of projection and contamination, depending on the area (highest risk at the sink), but the bacteria did not survive beyond 3 h. This practice, which carries a risk of cross-transmission, should be reviewed.