Primrose Freestone, Associate Professor in Clinical Microbiology at the University of Leicester and science communicator, is an infectious diseases expert, and has dived into the debate of whether swimming in a pool or in the natural environment is the safer option. She also takes us through the cleanliness of hot-tubs (hint, they're gross.)

Songs in this episode - all licensed under a Creative Commons License:

• Bugs - GNAAR

Photo from wikimedia