How Long do Nosocomial Pathogens Persist on Inanimate Surfaces? A Scoping Review.

Healthcare hygiene plays a crucial role in the prevention of healthcare associated infections. Patients admitted to a room where the previous occupant had a multidrug resistant bacterial infection are at an increased risk of colonisation and infection with the same organism. A 2006 systematic review by Kramer et al found that certain pathogens can survive for months on dry surfaces. The aim of this review is to update Kramer et al's previous review and provide contemporary data on the survival of pathogens relevant to the healthcare environment. We systematically searched Ovid MEDLINE, CINAHL and Scopus databases for studies that described the survival time of common nosocomial pathogens in the environment. Pathogens included in the review were bacterial, viral, and fungal. Studies were independently screened against predetermined inclusion/exclusion criteria by two researchers. Conflicts were resolved by one of two senior researchers. A spreadsheet was developed for the data extraction. The search identified 1,735 studies. Following removal of duplicates and application of the search criteria, the synthesis of results from 62 included studies were included. 117 organisms were reported. The longest surviving organism reported was Klebsiella pneumoniae which was found to have persisted for 600 days. Common pathogens of concern to infection prevention and control, can survive or persist on inanimate surfaces for months. This data supports the need for a risk based approach to cleaning and disinfection practices, accompanied by appropriate training, audit and feedback which are proven to be effective when adopted in a 'bundle' approach.