The ‘last hope’ antibiotic could be useless within a decade as the use of the drug to fight hospital superbugs soars.

Figures show prescriptions of colistin, which is used on patients when infections have become resistant to all other drugs, rose by 40 per cent from 2014 to 2015.

Experts fear increasing use will spark a crisis that will see superbugs developing resistance to the antibiotic considered to be the last resort.

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