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Too-dilute disinfectant boosts bacteria resistance

Pseudomonas aeruginosa, a bacterium responsible for severe chest infections, can become tolerant to the commonly used mild disinfectant benzalkonium chloride. The bug develops mutations that enable it to expel the disinfectant. Worse still, tolerant strains can also shrug off ciprofloxacin, a fluoroquinolone antibiotic widely used to treat gut and urinary tract infections.
 
 

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