The deadly toxin produced by anthrax bacteria can hide out in human cells for days, invisible both to our immune systems and to the cellular machinery responsible for destroying proteins. The findings reported in the Cell Press journal Cell Reports explain why antibiotics aren't always enough to cure anthrax infections."The anthrax bacteria kills people in a very short period of time, and this is in large part due to the production of the anthrax lethal toxin," said Gisou van der Goot of the École Polytechnique Fédérale de Lausanne.

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