The Prime Minister said concerted action was needed to prevent the world from being ‘cast back into the dark ages of medicine’.
The rise of untreatable bacteria is one of the biggest health threats facing the world, threatening an 'unthinkable scenario’ where minor infections could once again kill.
Tens of thousands of people are already dying of infections that have evolved resistance to common treatments.
The World Health Organisation has warned that routine operations and minor scratches could become fatal if nothing is done.
Mr Cameron said: 'For many of us, we only know a world where infections or sicknesses can be quickly remedied by a visit to the doctor and a course of antibiotics.
'This great British discovery has kept our families safe for decades, while saving billions of lives around the world.
'But that protection is at risk as never before.
'Resistance to antibiotics is now a very real and worrying threat, as bacteria mutates to become immune to its effect.’
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