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

本帖最后由 mintzoe 于 2013-2-19 16:44 编辑

In this 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 more than 170 million dollars on hand sanitizers alone. So we wondered what works best, and how does the sanitizers compare in a showdown with soap? Well tonight, our chief medical editor Dr. Richard Besser puts them to a test and gets some real answers.

Clean? As many as 400,000 germs per hand--that's how many bacteria travel with us everyday. So here are the University Maryland Food Safety Lab, six brave grads students and I voluntarily dust our hands in a toxic brew of thousands of Ecoli bacteria. Yeah. Ecoli.


Good. Something now a little odd about rubbing Ecoli.
To see what would take it off. First step, hands sanitizers. We tested two kinds you'll find at the store: one with 60% of alcohol, and one 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 the air dry, OK?
Then we press our hands onto special incubation plates to grow any remaining bacteria. The results? Dramatic. Here, those green spots are the Ecoli. They grew from the unwashed hands. After, using hand sanitizer with 60% alcohol, but the formula without alcohol? Just look how many germs left behind. Alcohol-based hand sanitizer works 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 well on bacteria as a sanitizer, it get more viruses too. Surprisingly, study show regular anti-bacteria soap are about equally effective. But how you use it is crucial. Ready? Go!


Most of us only spend five seconds at the sink. Stop. Just look how many germs remain. Yek!


Go! You have to wash your hands for full 20 seconds to really get the bugs off. And yes, that's sing happy birthday twice. So let's review it again. Hands in sanitizers if you can't get to a sink. Look for one with at least 60% alcohol, but wash with soap, all kind is better, as long as you wash for long enough.
Dr. Richard Besser, ABC News, College Park, Maryland.

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