Cells at Work! 5

Life's not easy for a workaday cell and amid all the hustle and bustle it takes to keep the human body going it can be hard to know who's an enemy and who's a friend. You might think all germs are bad but it turns out some bacteria aren't just friendly they're downright essential (not to mention cuddly!) In fact when an old nemesis returns it might just be those friendly cuddly bacteria that help save the day. The saga of life inside you continues!