Newsnight's Susan Watts meets the scientists tackling the bacteria which could stop 21st Century treatments.
The arrival of antibiotics in the 1940s revolutionised healthcare, but bacteria are fighting back and doctors and scientists are warning that ever-evolving resistant strains are putting modern medicine at risk.
"Antibiotics are losing their effectiveness at a rate that is both alarming and irreversible," said the Chief Medical Officer for England and Wales, Dame Sally Davies, earlier this month.
Microbiologist at the University of Birmingham, Prof Laura Piddock, told BBC's Newsnight that antibiotics are miracle drugs which underpin all areas of 21st Century medicine.
"But if we allow resistance to proliferate, then we undermine all of those medical advances," she said.
Unusually, Prof Piddock, and other specialists like her, are campaigning to persuade governments and industry to do more to preserve current antibiotics, and find new ones.
They are concerned that we overuse these drugs, most recently through online sales on the internet.
Prof Piddock explained that when you take an antibiotic you are having an impact not only on your health, but potentially on that of other people too.
"It's not like other types of medicine," she explained.