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Home » Study shows how antibiotic-resistant bacteria spread from hospital sink drain pipe?

Study shows how antibiotic-resistant bacteria spread from hospital sink drain pipe?

March 1, 2017
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Droplet dispersion in a hand wash sink traced using GloGerm and illuminated with UV light. Degree of the dispersion is evident from the fluorescent spots (orange and white) seen on the sink counter, faucets, and faucet handles.

Many recent reports have found multidrug resistant bacteria living in hospital sink drainpipes, putting them in close proximity to vulnerable patients. But how the bacteria find their way out of the drains, and into patients has been unclear. Now a team from the University of Virginia, Charlottesville, has charted their pathways. The research is published Feb. 24 in Applied and Environmental Microbiology, a journal of the American Society for Microbiology. 

“Our study demonstrates that bacterial spread from drainpipes to patients occurs via a staged mode of transmission,” said principal investigator Dr. Amy Mathers, MD, associate professor of Medicine and Pathology, Division of Infectious Diseases and International Health at the university.

Initially, the bacteria colonize the elbows of the drain pipes. The investigators showed that from there, the colonies grow slowly towards the sink strainers – at the rate of roughly 1 inch per day, said Mathers.

Given the distance in typical hospital sinks of elbows below the sink bowls, it frequently takes a week for the colonies to reach the sink strainers. From there, bacteria quickly get splattered around the sink, and even onto the counters surrounding the sinks, where they can be picked up by the patients.

The project grew out of the knowledge that patients are dying from infections with multidrug-resistant bacteria that they acquire while hospitalized. In a review Mathers’ team conducted with Alice Kizny Gordon, MBBS (a degree that is common in UK and is like MD) and colleagues of the University of Oxford, UK, they found more than 32 papers describing the spread of bacteria resistant to carbapenem – an important antibiotic – via sinks and other reservoirs of water within hospitals. Half of those papers have appeared since 2010.

In many parts of the world, hospitals are ill-equipped to cope with these superbugs, as in many cases there are few treatment options.

“We wanted to better understand how transmission occurs, so that the numbers of these infections could be reduced,” Mathers said.

The work entailed building what Mathers said is “the only sink lab we are aware of in the U.S.”

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