Americans are dead serious about the war on germs. These days, you can find germ-killing chemicals in just about every consumer product imaginable, from toothpaste to children's toys.

We slather antibacterial soaps, lotions and deodorants on our bodies. We spray antibacterial cleansers on our bathroom fixtures and kitchen appliances. We suds our clothes with antibacterial laundry detergents.

It may seem like the responsible thing to do, but the overuse of antibacterial products ...

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