Elevator Buttons More Likely to be Colonized by Bacteria Than Toilet Surfaces


Elevator buttons are more likely to be colonized by bacteria than toilet surfaces, a new Sunnybrook-led study of three large urban hospitals has found.

“Elevators are a component of modern hospital care, and are used by multiple people with ungloved hands who will later go on to make contact with patients,” says study co-author Dr. Donald Redelmeier, a staff physician in the division of general internal medicine at Sunnybrook Health Sciences Centre and a researcher with the Institute for Clinical Evaluative Sciences (ICES).

At each hospital, 120 randomly selected interior and exterior elevator buttons were swabbed over a 10-day period. These were compared against swabs of toilet surfaces in men’s washrooms, including exterior and interior entry-door handles, the privacy latch and the toilet flusher.

Sixty-one percent of the elevator button samples showed microbiological growth, compared to only 43 percent of the toilet surface samples. Bacteria cultured from the elevator buttons and toilet surfaces included Staphylococcus, Streptococcus, coliform bacteria, Enterococcus and Pseudomonas, though they are unlikely to cause specific diseases in most cases.

“We were surprised by the frequency of bacterial colonization on the elevator buttons, but we were also struck by how easily it could be avoided, specifically by the use of good handwashing or hand hygiene,” says co-author Dr. Andrew Simor, chief of the department of microbiology and infectious diseases at Sunnybrook.

The authors suggest several strategies for reducing the frequency of bacterial colonization on commonly touched surfaces. “Use alcohol-based hand sanitizer before and after touching the buttons, or avoid touching them altogether by using the tip of a pen or your elbow,” says lead author Dr. Christopher Kandel, a fellow in the department of infectious diseases at the University of Toronto. “Educating the public about the importance of hand hygiene when in a hospital may also help reduce the rate of colonization.”

The study was published July 8, 2014 in Open Medicine Journal.

Source: Sunnybrook Health Sciences Centre

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