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[万花筒] 【整理】2013-02-14&02-17 如何洗手最干净?洗手液-肥皂杀菌效果大对决

提高英语听力能力 找对方法很重要!
In this season of flu and so many other germs, we told again and again that hand sanitizers and soaps are the best defense. Last year in America spent more than 170 million dollars on hand sanitizers alone. So we wondered what works best and how do the sanitizers compare in the showdown with soap. Well tonight our chief medical editor Dr. Richard Besser puts them up to the test and gets some real answers.
Clean.
As many as 400000 germs per hand, that’s how many bacteria travel with us bevery day. So you are in the university of Maryland Food and Safety Lab, 6 brave grat students tonight, voluntarily dust their hands in a toxic brew with thousands of ecoli-bacteria, yep, ecoli.
Good, something that little odd about rubbing ecoli.
To see what they will take it off, first step, hand sanitizers. You tested two kinds you find in this store, one the 60% alcohol, and one so-called natural formula containing no alcohol. They key with hand sanitizers is to use enough of it, you hands should take a full 15 seconds or longer to dry.
Now let that air dry, okay?
Then we pressed our hands on this special incubation plates to grow in your remaining bacteria. The results, dramatic. Here those green spots are the ecoli grew from unwashed hands, after using hand sanitizers with 60% alcohol, but the formula without alcohol, just look how many germs left behind. Alcohol based sanitizer worked so much better because alcohol breaks the bacteria proteins and kills them. But if you really want to get a clean, what’s the best of them all?
Guess what? It’s your old friend, soap. Soap not only does well on bacteria as the sanitizers, it kills more viruses too. Surprisingly, studies show that regular and anti-bacteria soap are about equally effective. But how you use it is crucial, most of us only use it 5 seconds at the same.
Stop.
Just look how many germs remain. Yuck.
Go.
You have to wash your hands for a full 20 seconds to really get the bugs off, and yep that’s singing happy birthday twice. So let’s review it again, hand sanitizers if you can’t get to a sink, look for one with at least with 60% alcohol, but wash with soap, any kind is better as long as you wash for long enough.
Dr Richard Besser, ABC News, Maryland
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