11:00 05 April 2012
Microscopic malefactors sometimes escape antibiotic punishment by playing dead. These "persisters" are responsible for some of the hardest-to-fight infections that afflict humanity ? see their true faces here.
Read more: "Sleeper cells: How to fight bacteria that play dead"
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Mycobacterium tuberculosis is the bacterium that causes TB, one of humanity's oldest and deadliest foes. It is thought that up to a third of the world's population have a dormant form, which can reactivate if the immune system weakens.(Image: CDC/Phanie/Rex Features)
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