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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

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本帖最后由 jennysyy 于 2013-2-26 22:11 编辑

HOMEWORK

In the season of flu and so many other germs, we were told again and again that hand sanitizers and soap are the best defense. Last year, Americans spent $170 million on hand sanitizers alone. So we wondered what works best and how do the sanitizers compare in a showdown with soap? Well, tonight our chief medical editor Dr. Richard Besser puts them to the test and gets some real answers.

Clean? As many as 400,000 germs per hand, that’s how many bacteria travel with us every day. So here at the University of Maryland Food Safety Lab, six brave grad students and I voluntarily dust our hands in a toxic brew, the thousands of ecoli bacteria. Yeah, ecoli.

“Good? Something a little odd about rubbing ecoli.”

To see what would take it off.

First up, hands sanitizers. We tested two kinds you’ll find at the store: one with 60% alcohol, and on so-called natural formula containing no alcohol. The key with hand sanitizers is to use enough of it. Your hands should take a full 15 seconds or longer to dry.

“Now let that air dry, ok?”

Then we pressed our hands onto special incubation plates to grow any remaining bacteria. The result? Dramatic. Here, those green spots are the e-coil that grew from unwashed hands. After, using hand sanitizer with 60% alcohol. But the formula without alcohol? Just look how many germs left behind.

Alcohol based sanitizers work so much better because alcohol breaks up the bacteria’s proteins and kills them. But if you really want to get clean, what’s your best of all? Guess what? It’s your old friend –- soap.

Soap not only does as well on bacteria as the sanitizer, it gets more viruses too. Surprisingly, studies show regular and antibacterial soap are about equally effective. But how you use it is crucial.

“Go!”

Most of us only spend five seconds at the sink.

“Stop!”

Just look how many germs remain. Yuk!

“Go!”

You have to wash your hands for a full twenty seconds to really get the bugs off. And yeah, that’s singing “Happy Birthday” twice.

So let’s rebuild again. Hand sanitizers if you can’t get to a sink. Look for one with at least 60% alcohol, but washing with soap -- any kind -- is better, as long as you wash for long enough.

Dr. Richard Besser, ABC News, College Park, Maryland.
知足、感恩、奋斗
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