Where do antibiotics end up after we've used them? The answer is almost everywhere – in our soils and crops, in our rivers and in our drinking water.

Is this something we should be concerned about? And is it driving the evolution of resistance?

In this Microbe Talk Extra, we spoke to Dr Will Gaze from the University of Exeter Medical School about antimicrobial resistance in the environment, and his lab's research on water treatment plants, coastal waters, and surfers' bums.