Operation Ouch! Snips: Germ-Fighters

Doctors Xand and Chris van Tulleken reveal the amazing army of germ-fighters that make up a person's immune system, and find out just how difficult it is to clean a baby's incubator. Xand meets Alex who has autism, and catches up with Ouch Patients Holly and Haiden. Meanwhile, in Accident & Emergency, one patient has cut her nose and another injured his toe