Yeah, they absolutely can. I mean, as I've said, it's not straightforward. This is very different to having a pharmaceutical chemical that we can use on millions of people. There is lab work involved with each case, and you're talking about treating people with a living, evolving thing often that's been found in a kind of river or sewer. So there's just huge numbers of logistical and regulatory challenges around this. But they have been evolving for billions of years to kill bacteria. They are amazingly good at it. And there are countless examples now of phage therapy being used to save the life of people who have infections that are resistant to every known antibiotic in the cabinet.

Tom Ireland's book is called The Good Virus, the amazing story and forgotten promise of the phage. We'll be back in just a minute to talk to a scientist who is using phages to treat disease now.

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