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The Times

Why do disinfectants only kill 99.9% of germs? Here’s the science

  • Written by Hassan Vally, Associate Professor, Epidemiology, Deakin University
Why do disinfectants only kill 99.9% of germs? Here’s the scienceDavor Geber/Shutterstock

Have you ever wondered why most disinfectants indicate they kill 99.9% or 99.99% of germs, but never promise to wipe out all of them? Perhaps the thought has crossed your mind mid-way through cleaning your kitchen or bathroom.

Surely, in a world where science is able to do all sorts of amazing things, someone would have...

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