Resistance to antibiotics poses a "major global threat" to public health, says a new report by the World Health Organization (WHO).
It analysed data from 114 countries and said resistance was happening now "in every region of the world".
It described a "post-antibiotic era", where people die from simple infections that have been treatable for decades.
There were likely to be "devastating" implications unless "significant" action was taken urgently, it added.
The report focused on seven different bacteria responsible for common serious diseases such as pneumonia, diarrhoea and blood infections.
It suggested two key antibiotics no longer work in more than half of people being treated in some countries.
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