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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

In the season of flu and so many other gems,we are told again and again that hand sanitizers and soap are the best defence.Last year,America spent more than 170 million dollars on hand sanitizers alone.So we wondered what's its best?And how does sanitizer compare in the 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 everyday.So you are in university of Maryland and * lab,six brave grad students tonight voluntarily dust hands in the toxic brew ,a thousand of Ecoli bacteria.Yep,Ecoli.Good,something is a little odd about rubbing Ecoli.To see what will take it off.
First up,hand sanitizers,we tested two kinds you will find in the store.One with 60% alcohol and one so-called natural formula containing no alcohol.The key with hand hanitizers is to use enough of it.Your hands should take a full 15-second 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 results,dramatic,here those green spots are the Ecoli that grew from unwashed hands.After,using hand sanitizer with 60% alcohol,but the formula without alcohol,just look how many germs are 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 bet of all?Guess what,it's your old friend,soap.Soap not only does well on bacteria as the sanitizer,it gets more viruses too.Surprisingly,studies show regular and anti-bacterial soap are 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 20 seconds to really get the bugs off.And yes,that's singing happy birthday twice.So let's review it again.Hand sanitizers are becoming to give a think.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 new,college of Maryland.

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