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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]【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

In this season of flu, and so many other germs were told again and again that hand, sanitizer and soap are the best offense. Last year, Americans spent more than 170 million dollars on hand sanitizer is alone, so we wondered what works best and how did the sanitizer comparing a showdown with soap. Well, tonight our chief medical editor, doctor Richard, better put them to the test and get some real answers. As many as 400000 for and that's how many bacteria travel with us every day. The university of Maryland from 6 gard students and I voluntarily gas her hand in a toxic brew thousands of ecoil bacteria. Yep, ecoil. To see what we take it off. First up, hand sanitizers, we get it two kinds you find at the store, one with 60 percent alcohol, and one so-called natural formula containing no alcohol. The key withhand 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 on a special inclubation plates, to grow any remaining bacteria. The results, dramatic. Here, those green spots are like unwashed hands. After, using hand sanitizer with 60 percent alcohol, but  the with all alcohol, just look at how many germs are left behind. Alcohol based hand, it work so much better because alcohol breaks up the bacteria proteins and kills them. But if you really want to get clean, what's your best bit of all? Guess what, it's your old friend,so not only does as well as the sanitizer, it gets more viruses too. Surprisingly, study show regular and about equally effective, but how you use it is crucial. Most of us only spend five seconds at the sink. Just look how many germs remain. 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 review it again. Hand sanitizer if you can get to a sink. Look for one with at least 60 percent 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.
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