Los Angeles Times, April 1, 2011

Hands-free electronic faucets can save a lot of water -- and because you don?t have to touch them with your grubby fingers to turn them on, have widely been assumed to help fight the spread of germs, too. But a team at the Johns Hopkins Hospital in Baltimore has discovered that at their facility, electronic faucets were more likely to be contaminated with Legionella bacteria than the old-fashioned manual type. So much more likely that the hospital actually ripped out the new-fangled plumbing in patient care areas, and elected to purchase traditional fixtures for new clinical buildings that are set to open in 2012. "Newer is not necessarily better when it comes to infection control in hospitals," said Johns Hopkins infectious disease expert Lisa Maragakis, MD, in a statement. Maragakis was the senior investigator on the research.
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