Assessment of materials commonly utilized in health care: implications for bacterial survival and transmission.
BACKGROUND
Contaminated environmental surfaces, equipment, and health care workers' hands have been linked to outbreaks of infection or colonization because of vancomycin-resistant enterococci (VRE) and Pseudomonas aeruginosa (PSAE). Upholstery, walls, and flooring may enhance bacterial survival, providing infectious reservoirs.


OBJECTIVE
Investigate recovery of VRE and PSAE, determine efficacy of disinfection, and evaluate VRE transmission from surfaces.


METHODS
Upholstery, flooring, and wall coverings were inoculated with VRE and PSAE and assessed for recovery at 24 hours, 72 hours, and 7 days. Inoculated surfaces were cleaned utilizing manufacturers' recommendations of natural, commercial, or hospital-approved products and methods, and samples were obtained. To assess potential for transmission, volunteers touched VRE-inoculated surfaces and imprinted palms onto contact-impression plates.


RESULTS
Twenty-four hours following inoculation, all surfaces had recovery of VRE; 13 (92.9%) of 14 surfaces had persistent PSAE. After cleaning, VRE was recovered from 7 (50%) surfaces, PSAE from 5 (35.7%) surfaces. After inoculation followed by palmar contact, VRE was recovered from all surfaces touched.


CONCLUSIONS
Bacteria commonly encountered in hospitals are capable of prolonged survival and may promote cross transmission. Selection of surfaces for health care environments should include product application and complexity of manufacturers' recommendations for disinfection. Recovery of organisms on surfaces and hands emphasizes importance of hand hygiene compliance prior to patient contact.
Lankford
Mary G
MG
Division of Operations and Quality, Patient Safety, Northwestern Memorial Hospital, Chicago, IL 60611, USA. mlankfor@nmh.org
Collins
Susan
S
Youngberg
Larry
L
Rooney
Denise M
DM
Warren
John R
JR
Noskin
Gary A
GA
D003428:Cross Infection / Q000209:etiology*; D004202:Disinfectants / Q000494:pharmacology; D016983:Enterococcus / Q000187:drug effects / Q000302:isolation & purification*; D004866:Equipment Contamination / Q000706:statistics & numerical data*; D004865:Equipment and Supplies, Hospital / Q000382:microbiology*; D006801:Humans; D007374:Interior Design and Furnishings; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000302:isolation & purification*; D020713:Vancomycin Resistance
D004202:Disinfectants