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Claudia Hammond focusses on the attempts to discover new antibiotics, and alternative therapies for combating bacterial infection.

Most of the antibiotics we use were discovered in the mid-20th century, but as the threat of drug resistant infections increases, the race is on to find new organisms that make novel medicines. We have only identified a tiny fraction of the microbes living on Earth and are "bioprospecting" for useful ones in wildly different locations. Microbiologist Matt Hutchings has been looking to the oldest farmers in the world - leaf cutter ants.

From exotic locations to under your fridge: Dr Adam Roberts runs a scheme called Swab and Send. It's a citizen science project that asks members of the public to swab a surface and send the sample to him – he'll analyse them to look for the presence of new antibiotic-producing bacteria. We joined in the hunt by swabbing spots around the Â鶹Éç: Adam's microphone, our tea kitchen's sponge, the revolving entryway doormat, and lastly, the Dalek standing on guard outside the Â鶹Éç Radio Theatre.

Antibiotics are not the only weapon in the war against bacteria. A hundred years ago, a class of virus that infect and destroy bacteria were discovered. They're called bacteriophages. Phage therapies were used throughout the era of Soviet Russia, and still are in some countries, including Georgia. Phage researcher Prof Martha Clokie told us whether phage therapy might be coming to the UK.

With expert comment from James Gallagher, Â鶹Éç News health reporter.

(Photo: A pharmacist looking at a bottle of medicine. Credit: Getty Images)