Antibacterial products may help bacteria beat antibiotics
The substance in question is triclosan. It is not an antibiotic but a different type of compound that, rather than killing bacteria, stops them from growing instead.

Triclosan is so widespread that there are concerns that this may encourage bacteria to evolve resistance to it, posing a problem for hospitals that use antibacterials to prevent infections spreading. These concerns have helped prompt the US Food and Drug Administration to ban the use of triclosan in consumer hand soaps, and the FDA is pondering further restrictions.

Now there’s reason to worry over even more serious effects. To see whether antibacterials can affect the performance of antibiotics, Petra Levin and Corey Westfall, at Washington University in St Louis, Missouri, exposed Escherichia coli to common antibiotics and triclosan, and measured their survival over 20 hours....
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