In response to recent fears about the future of antibiotics, the team investigates germs and infection. Liz Bonnin reveals why doctors can be reluctant to prescribe antibiotics for coughs and colds, and explains what bacterial resistance is all about. Maggie Philbin finds out whether people are right to worry about catching infections when cooped up inside an aeroplane, and reveals a remarkable new technique that takes the guesswork out of prescribing antibiotics. Meanwhile, Jem Stansfield heads to a scrapyard for a striking demonstration of the difference between viruses and bacteria.