Kills 99.9% of Germs -- Under Some Lab Conditions

Carl Bialik:

A decade of pesky germs, from SARS to avian flu to H1N1, has given rise to dozens of products bragging about their microbe-killing properties. Everything from hand-sanitizing liquids to products like computer keyboards, shopping carts and tissues tout that they kill 99.9%, or 99.99%, of common bacteria and fungi.

But some of these numbers look like the test scores in a class with a very generous grading curve. They often don't include all pesky germs, and are based on laboratory tests that don't represent the imperfections of real-world use. Human subjects, or countertops, in labs are cleaned first, then covered on the surface with a target bug. That is a far cry from a typical kitchen or a pair of grimy hands.

Posted by Jim Zellmer at December 17, 2009 3:22 AM
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