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回复 1# 绿茵场 http://newsfeedresearcher.com/data/articles_m14/faucet-water-electronic.html Apr-02-2011 Hands-free faucets harbor germs, Johns Hopkins study says Here's another reason to dislike them: They are more likely to carry deadly bacteria than the old-fashioned manual kind. That's according to a study by researchers at Johns Hopkins University who found electronic faucets which have more parts and valves than manual faucets -- are more likely to grow unacceptably high levels of bacteria. Specifically, they are more likely to have bacteria like Legionella(军团菌), which should not be a concern for the general healthy public, but can be deadly to people with compromised immune systems. The study's authors -- who will present their report Saturday at the annual gathering of the Society for Healthcare Epidemiology of America -- said it raises concerns about the safety of hands-free faucets in hospitals. That's because the no-touch faucets are being used more in health care facilities to conserve water and keep scrubbed hands from being re-contaminated. Leaders at Johns Hopkins Hospital already have announced they will replace hands-free faucets in clinical areas with manual faucets, and no longer plan to install electronic faucets in a new building under construction. [1] During the course of collecting water samples, researchers discovered that all of the electronic faucet parts grew Legionella spp. She explained that the study's findings should not create cause for concern over the use of electronic faucets by the general public. "The levels of bacterial growth in the electronic faucets, particularly the Legionella spp., were of concern because they were beyond the tolerable thresholds determined by the hospital. Exposure to Legionella spp. is dangerous for chronically ill or immune compromised patients because it may cause pneumonia in these vulnerable patients. The levels we found of both Legionella spp. and bacterial burden on HPC were still within the level that is well tolerated by healthy individuals," said Sydnor. Following the study, Johns Hopkins Hospital is replacing electronic faucets in clinical areas with manual faucets, and has decided not to install electronic faucets in clinical areas of its new hospital building now under construction. [2] The faucets will still be used at John Hopkins in restrooms intended for the public. "The levels of bacterial growth in the electronic faucets, particularly the Legionella species, were of concern because they were beyond the tolerable thresholds determined by the hospital," she commented in the release. "Exposure to Legionella species is dangerous for chronically ill or immune compromised patients because it may cause pneumonia in these vulnerable patients. The levels we found of both Legionella species and bacterial burden on HPC were still within the level that is well tolerated by healthy individuals." The suspected reason for the increased contamination in water from the electronic faucets is that they have more parts that can trap bacteria, Sydnor said. She noted that the study involved just one brand of electronic faucet. "There are five extra parts that you wouldn't have in a manual faucet," she said at the news briefing. [3]
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